MethShield Auto™ — Vehicle Meth Testing, Monitoring & Deterrence
MethShield Auto™ is New Zealand's patent-pending vehicle meth testing, baseline monitoring and visible deterrence programme. Vehicle meth testing, truck meth testing, car meth testing and fleet meth monitoring — the visible deterrent sticker isn't a test on its own, it's part of a complete testing and monitoring programme that aims to deter meth use before it starts. Powered by EnviroCheck.
Insurance & Recovered Stolen Vehicles
Was a vehicle stolen or used by an unauthorised person? MethShield Auto provides independent methamphetamine surface testing for insurers, assessors and owners of recovered vehicles.
Learn about Insurance Vehicle TestingVehicle Crime Prevention, Monitoring & Protection
MethShield Auto™ is a patent-pending vehicle meth deterrence and crime prevention system — making it clear that a car, ute, or motorhome is monitored and tested for meth contamination. The visible deterrent sticker isn't a test on its own — it's part of a complete testing and monitoring programme that aims to deter meth use before it starts. A vehicle cabin has a fraction of the air volume of a room — meaning the same meth residue that spreads thinly across a lounge can concentrate at significantly higher levels per surface area.
The programme combines vehicle meth testing, baseline monitoring and a visible deterrent sticker to support ongoing vehicle risk management — whether you own a single family car or manage a nationwide fleet.
MethShield Auto™ does not guarantee a vehicle will remain contamination-free. It provides a visible reminder that the vehicle is part of a structured testing, monitoring and deterrence programme.
Patent Pending
MethShield Auto™ is a patent pending deterrent system. New Zealand Patent Application No. 818430.
Why Vehicles Are Different
A typical vehicle cabin has roughly 2–3 cubic metres of air — a fraction of a room's 30+. Soft fabrics, carpets and headliners absorb and retain residue. When the ventilation runs, settled contamination can redistribute throughout the cabin.
MethShield Auto Vehicle Meth Testing Calculator
Explore approximate vehicle meth contamination and modelled smoke-dose equivalents using your laboratory test result.
1. Select your vehicle category
Choose the vehicle type that best matches yours.
2. Enter your laboratory methamphetamine result
Use a laboratory measurement expressed in µg/100 cm².
3. Calculation results
Enter a laboratory result above to see your calculation.
Important Notice
Vehicle sizes and interior volumes can vary between makes and models. Calculations are approximate and subject to a margin of error. Results are estimates only and should not be treated as confirmed contamination levels.
This vehicle meth testing calculator helps you interpret car meth test results from a New Zealand laboratory. Enter your methamphetamine testing vehicles result in µg/100 cm² to explore modelled vehicle meth contamination and approximate smoke-dose equivalents for your specific vehicle category.
Vehicle Meth Testing for Every Vehicle Type
Vehicle meth testing is methamphetamine contamination testing for cars, SUVs, motorhomes, RVs, campervans, trucks, utes, vans and commercial fleet vehicles. Methamphetamine testing for vehicles follows the same laboratory-aligned surface sampling methodology as property testing — methodical wipe sampling of dashboards, seats, headliners, door panels, carpets and air conditioning systems, submitted to an accredited laboratory for analysis.
A vehicle is a confined space with a fraction of the air volume of a room, meaning meth residue from smoking can concentrate at significantly higher levels per surface area. Vehicle contamination testing provides documented evidence of whether methamphetamine residue is present — giving buyers, fleet operators and insurers certainty about what they're bringing onto the road. For full testing service details, see our vehicle meth testing page.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
Pre-Purchase Vehicle Meth Testing
A pre-purchase vehicle meth test is one of the most valuable checks you can carry out before buying a used car, motorhome or commercial vehicle. Meth residue testing for cars tells you whether the previous owner left behind contamination you can't see — and a pre-purchase car meth test costs a fraction of a decontamination bill that can exceed the vehicle's value.
Used car meth testing is particularly important for imports, ex-rental vehicles, repossessions and auction purchases where the vehicle's history is unknown. A vehicle meth inspection before you commit gives you certainty and peace of mind — and gives you grounds to negotiate or walk away if contamination is found. Meth testing used vehicles is becoming standard practice, just like pre-purchase house testing.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
Baseline Vehicle Testing & Monitoring
Vehicle baseline meth testing establishes a documented, factual record of a vehicle's contamination status at a specific point in time — typically before a new owner takes possession, before a rental period begins, or at the start of a fleet monitoring programme. If contamination is later suspected, the baseline provides a comparison point.
MethShield Auto™ combines vehicle baseline testing with visible deterrence and periodic monitoring to create a complete vehicle meth protection programme — not just a one-off test. Vehicle baseline monitoring at regular intervals tracks the condition of every vehicle over time, creating a documented chain of evidence that supports insurance positions, fleet compliance and health and safety obligations.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
Meth Contamination in Cars & Vehicles
Meth contamination in cars is a recognised issue in New Zealand. A vehicle cabin has roughly 2–3 cubic metres of air — a fraction of a room's 30+. When methamphetamine is smoked inside a vehicle, the residue settles on every surface: seats, dashboards, headliners, door panels, carpets and the air conditioning system. A meth contaminated vehicle can have significantly higher surface contamination levels per area than a house.
Soft interior materials — upholstery, carpet, headliner fabric — absorb and retain methamphetamine residue more readily than hard surfaces. When the ventilation runs, settled contamination can redistribute throughout the cabin. Meth residue testing for vehicles can detect contamination long after the event, which is why a documented test matters before you buy, sell, or return a vehicle to service.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
Fleet Meth Testing & Monitoring
Fleet meth testing protects every vehicle in your operation — work utes, vans, trucks and company cars shared by multiple drivers. Vehicle fleet meth testing establishes a documented baseline for each vehicle, then monitors at intervals to track condition over time. Fleet drug contamination testing supports health and safety obligations, strengthens insurance positions, and creates a documented record of active vehicle risk management.
A fleet meth deterrent programme combines baseline testing, periodic monitoring and visible MethShield Auto™ deterrence across the entire fleet. Company vehicle meth testing scales from a handful of cars to hundreds — every vehicle gets the same documented standard of care. For fleet operators, this means defensible evidence that active risk management was in place across every vehicle, not just reactive testing after a problem is discovered.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
Rental Vehicle Meth Monitoring
Rental vehicle meth testing and monitoring is essential for operators whose vehicles change hands constantly. Every rental is a stranger in a confined space — different drivers, unknown histories, and no control over what happens inside. A single meth-smoking session can contaminate the interior, and the next customer inherits the residue.
Rental car meth testing combined with MethShield Auto™ deterrence creates a documented monitoring programme that signals every vehicle is watched. The visible deterrent at handover, combined with baseline testing between rentals, helps protect both the vehicle and the operator's reputation. Fleet-wide packages are available from a handful of cars to hundreds.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
Car Yard & Used Vehicle Testing
Car yard meth testing and dealer vehicle meth testing are growing practices in New Zealand. Dealers who test vehicles before listing them for sale can provide buyers with documented evidence of a clean bill of health — building buyer confidence and differentiating their stock from untested vehicles on the market.
MethShield Auto™ offers dealer-specific packages that combine baseline testing with visible deterrent stickers, signalling to every customer that the vehicle has been checked. Used car dealer meth testing also protects the dealer from post-sale disputes about contamination — if the vehicle was tested clean before sale, the dealer has defensible evidence. Car meth protection through MethShield Auto™ gives both dealers and buyers confidence.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
How Vehicle Meth Testing Works
A vehicle meth test follows a structured process. First, the assessor confirms the purpose of the assessment and the vehicle's history. Then methodical surface wipe sampling is carried out across high-contact and high-absorption surfaces — dashboard, steering wheel and column, centre console, seats, headliners, door panels, carpets and air conditioning vents.
Samples are submitted to an accredited laboratory for methamphetamine analysis, with results typically available within a few business days. A written report sets out what was sampled, how, and what the results mean — interpreted in the context of the vehicle, its history and the purpose of the assessment. The entire process typically takes 30–60 minutes on-site. MethShield Auto™ adds visible deterrence and baseline monitoring to this process, creating a complete vehicle meth protection programme rather than a one-off test.
Key Points
MethShield Auto™ combines testing, baseline monitoring and visible deterrence into a complete vehicle meth protection programme.
MethShield Auto™ for Every Fleet Type
From a single family car to a nationwide trucking fleet, MethShield Auto™ scales to protect every vehicle in your care. Each programme is tailored to the vehicle type, the operating environment and the risk profile.
Truck Meth Testing & Fleet Deterrence
Truck meth testing protects every cab in your fleet. A truck cab is a confined workspace where drivers spend long hours — and when multiple drivers share a rig, the contamination risk multiplies. Truck fleet meth testing establishes a documented baseline for each vehicle, then monitors at intervals to track condition over time. Methamphetamine residue settles on steering wheels, seats, headliners, door panels and the air conditioning system, and soft sleeper-cab fabrics absorb and retain it.
MethShield Auto™ combines truck meth testing with visible deterrence and periodic monitoring across your entire trucking fleet. The windscreen deterrent sticker signals to every driver and relief driver that the vehicle is monitored and tested — supporting health and safety obligations, strengthening insurance positions, and creating a documented record of active vehicle risk management. Fleet packages scale from a handful of rigs to nationwide fleets.
For confined-cab truck and ute testing specifically, see our truck & ute meth testing page.
Key Points
Commercial Vehicle Meth Testing
Commercial vehicle meth testing covers company cars, work utes, vans and light commercial vehicles shared by multiple drivers. Every change of driver is a new risk window — you have no way of knowing what happened inside that vehicle on the previous shift. Commercial fleet meth testing establishes a documented baseline for each vehicle, then monitors at intervals to track condition over time.
MethShield Auto™ gives commercial operators a structured deterrence and monitoring programme — not just a one-off test. The visible deterrent sticker tells every employee, contractor and relief driver that the vehicle is part of a monitored programme. Combined with baseline testing and periodic monitoring, this creates defensible evidence that active vehicle risk management was in place across every vehicle in the commercial fleet.
Commercial vehicle meth testing also supports your wider commercial meth testing programme — the same independent, conflict-free testing principles applied to your premises and your vehicles.
Key Points
Dealership & Car Yard Testing
Car yard meth testing and dealer vehicle meth testing are growing practices in New Zealand. Dealers who test vehicles before listing them for sale can provide buyers with documented evidence of a clean bill of health — building buyer confidence and differentiating their stock from untested vehicles on the market. A pre-sale meth test costs a fraction of a decontamination bill, and it protects the dealer from post-sale disputes about contamination.
MethShield Auto™ offers dealer-specific packages that combine baseline testing with visible deterrent stickers. The MethCheck Auto™ signal on the windscreen tells every customer who walks the yard that the vehicle has been checked — a powerful sales differentiator. Used car dealer meth testing also creates a defensible record: if the vehicle was tested clean before sale, the dealer has evidence should a contamination claim arise later.
Dealership meth testing packages are available from a handful of vehicles to entire yards. Talk to us about a programme that fits your stock turnover.
Key Points
Rental Vehicle Meth Monitoring
Rental vehicle meth testing and monitoring is essential for operators whose vehicles change hands constantly. Every rental is a stranger in a confined space — different drivers, unknown histories, and no control over what happens inside. A single meth-smoking session can contaminate the interior, and the next customer inherits the residue along with your business's reputation.
MethShield Auto™ gives rental operators a documented deterrent programme that signals every vehicle is watched. The visible deterrent at handover, combined with baseline testing between rentals, helps protect both the vehicle and the operator's reputation. Fleet-wide packages are available from a handful of cars to hundreds — every vehicle gets the same documented standard of care.
Rental fleet meth monitoring also strengthens your position with insurers, franchise agreements and health & safety obligations across the entire rental operation.
Key Points
Insurance & Recovered Vehicles
Insurance vehicle meth testing supports claim decisions on recovered stolen vehicles and suspected contamination events. When a vehicle is stolen and later recovered, the question of whether it has been used to handle or consume methamphetamine can become central to the insurance claim. Stolen car meth contamination is a recognised issue in New Zealand — and independent testing is often the only reliable way to confirm whether a recovered vehicle is contaminated before it is repaired, returned or settled.
EnviroCheck provides independent, conflict-free surface sampling and accredited laboratory analysis for insurers, assessors and loss adjusters. We do not carry out remediation, so our findings serve the assessment — not a downstream clean-up invoice. A documented test result gives the insurer defensible evidence of the vehicle's condition before a repair, write-off or return decision is made.
For full insurance vehicle testing details, see our insurance & recovered stolen vehicle meth testing page.
Key Points
Vehicle Meth Deterrence as Crime Prevention
Every competitor in New Zealand offers vehicle meth testing. None offer a structured crime-prevention deterrent system. MethShield Auto™ is the only vehicle meth deterrence programme designed to stop contamination before it starts — not just detect it after the fact.
Deterrence, Not Just Detection
A car meth deterrent tells anyone who enters the vehicle that it is monitored and tested. Vehicle meth deterrence aims to prevent meth use inside the vehicle — reducing the likelihood of contamination rather than only finding it later.
Meth Prevention for Every Vehicle
Meth prevention for a vehicle works the same way as crime prevention for a home: visible, professional signals that the property is watched. From a single family car to a nationwide fleet, the principle is the same.
Fleet Meth Deterrence at Scale
Fleet meth deterrence protects every vehicle in your operation — work utes, vans, trucks and company cars. Documented baseline testing, periodic monitoring and visible deterrence across the entire fleet.
Built for Every Vehicle & Fleet
Private Vehicles
Family cars, SUVs, second-hand purchases and imports — know what you're bringing home.
Car Yards & Dealers
Give buyers confidence with documented testing and visible deterrence on the windscreen.
Rental Fleets
Rental cars change hands constantly — protect every vehicle in your fleet with documented deterrent protocols.
Company & Commercial Fleets
Work utes, vans and trucks shared by multiple drivers — duty of care to your team.
Testing, Monitoring & Deterrence
MethShield Auto™ combines laboratory-aligned testing, documented baseline monitoring and a visible deterrent sticker — a complete vehicle risk management programme.
Pre-Purchase Meth Testing
Test a vehicle before you buy. A pre-purchase meth check costs a fraction of a decontamination bill and gives you certainty before you commit.
Vehicle Meth Residue Testing
Laboratory-aligned surface testing of dashboards, seats, headliners, door panels, carpets and air conditioning systems.
Fleet Monitoring & Baseline Testing
Establish a documented baseline for every vehicle in your fleet, then monitor at intervals to track condition over time.
Visible Deterrent Sticker
A small, discreet MethShield Auto™ sticker applied to the windscreen — a visible signal that the vehicle is monitored and tested.
Request a Fleet Quote
Tell us about your fleet and we'll prepare a tailored MethShield Auto™ programme quote. We respond within the business day.
MethShield Auto™ FAQs
What is the difference between vehicle meth testing and MethShield Auto™ deterrence?
Vehicle meth testing tells you whether methamphetamine residue is present in a vehicle at a point in time. MethShield Auto™ is a crime-prevention deterrent system — it aims to stop contamination from happening in the first place. The visible deterrent sticker signals that a vehicle is monitored and tested, making it a less attractive target for meth use. Testing detects; deterrence aims to prevent. Together they form a complete vehicle risk management programme.
How does the MethShield Auto™ deterrent sticker work?
The deterrent sticker is a small, discreet marker applied to the windscreen. It signals to anyone who enters the vehicle that the vehicle is part of a structured testing and monitoring programme. The sticker is not a test on its own — it is a visible crime-prevention signal that works alongside baseline testing and periodic monitoring. The aim is to deter meth use before it starts, rather than only detecting it after the fact.
Is MethShield Auto™ suitable for fleet vehicles?
Yes. Fleet meth deterrence is one of the core uses of MethShield Auto™. Work utes, vans, trucks and company cars shared by multiple drivers benefit from documented baseline testing, periodic monitoring and visible deterrence. For fleet operators, the programme supports health and safety obligations, strengthens insurance positions, and creates a documented record of active vehicle risk management across every vehicle in the fleet.
Can rental car operators use MethShield Auto™?
Yes. Rental cars change hands constantly — different drivers, unknown histories, and no control over what happens inside. MethShield Auto™ gives rental operators a documented deterrent system that signals every vehicle is monitored. The visible deterrent at handover, combined with baseline testing between rentals, helps protect both the vehicle and the operator's reputation. Fleet-wide packages are available from a handful of cars to hundreds.
Is MethShield Auto™ a patented system?
MethShield Auto™ is a patent-pending deterrent system. New Zealand Patent Application No. 818430 has been filed. The system is designed and owned by EnviroCheck. It is the only vehicle meth deterrence programme of its kind in New Zealand — every competitor offers testing, but none offer a structured crime-prevention deterrent system designed specifically for vehicles.
Does MethShield Auto™ guarantee my vehicle will stay meth-free?
No. MethShield Auto™ does not guarantee a vehicle will remain contamination-free. It provides a visible reminder that the vehicle is part of a structured testing, monitoring and deterrence programme. The deterrent aims to reduce the likelihood of meth use inside the vehicle, but no deterrent system can guarantee prevention. Regular testing remains the only way to confirm a vehicle's contamination status.
Can a vehicle be contaminated with methamphetamine?
Yes. A vehicle is a confined space with a fraction of the air volume of a room, meaning methamphetamine residue from smoking can concentrate at significantly higher levels per surface area. Meth contamination in cars is a recognised issue — soft fabrics, carpets and headliners absorb and retain residue, and the air conditioning system can redistribute settled contamination throughout the cabin. A meth contaminated vehicle may require full decontamination before it can be safely used again, and the cost can exceed the vehicle's value.
Can you test a car for methamphetamine residue?
Yes. Methamphetamine testing for vehicles involves methodical surface wipe sampling of dashboards, seats, headliners, door panels, carpets and air conditioning systems. Samples are submitted to an accredited laboratory for analysis. A vehicle meth inspection provides documented evidence of whether methamphetamine residue is present — and at what level. This is particularly valuable before purchasing a used car, as a pre-purchase vehicle meth test costs a fraction of a decontamination bill.
Can meth residue remain inside a vehicle?
Yes. Meth residue testing for vehicles can detect contamination long after the event. Soft interior materials — upholstery, carpet, headliner fabric — absorb and retain methamphetamine residue more readily than hard surfaces. When the ventilation runs, settled contamination can redistribute throughout the cabin. Even after cleaning, residue can persist in air conditioning ducting and deep in fabric fibres. This is why vehicle contamination testing uses laboratory-aligned surface sampling rather than visual inspection.
What is baseline vehicle meth testing?
Vehicle baseline meth testing establishes a documented, factual record of a vehicle's contamination status at a specific point in time — typically before a new owner takes possession, before a rental period begins, or at the start of a fleet monitoring programme. If contamination is later suspected, the baseline provides a comparison point. MethShield Auto™ combines vehicle baseline testing with visible deterrence and periodic monitoring to create a complete vehicle meth protection programme — not just a one-off test.
Can car dealers have vehicles meth tested?
Yes. Car yard meth testing and dealer vehicle meth testing are growing practices in New Zealand. Dealers who test vehicles before listing them for sale can provide buyers with documented evidence of a clean bill of health — building buyer confidence and differentiating their stock. MethShield Auto™ offers dealer-specific packages that combine baseline testing with visible deterrent stickers, signalling to every customer that the vehicle has been checked. Used car dealer meth testing also protects the dealer from post-sale disputes about contamination.