Why test
You can't see, smell or reliably guess methamphetamine residue. Paint can cover it, and an ordinary cleaning can leave it behind. Testing answers a factual question, whether measurable residue is present and where, so decisions about buying, renting, cleaning or occupying a property rest on data rather than suspicion.
People commonly test when:
- a buyer is doing due diligence on a property with a history or an unknown past
- a landlord suspects tenant drug use before re-leasing
- a seller wants to resolve uncertainty before listing
- a lender, insurer or REO manager needs documentation
- a vehicle may have been used for smoking or transporting drugs
- remediation is complete and clearance needs to be confirmed
How testing works
- Sampling plan. The sampler decides how many samples to take and where, based on the property size, room layout, HVAC configuration and the purpose of the test. Common locations include walls near ceilings, HVAC returns and supply registers, and surfaces where residue tends to collect.
- Wipe sampling. A defined surface area, typically 100 square centimeters, is wiped with a solvent-wetted media following a standard protocol. Samples may be discrete (one location per sample) or composite (several locations combined into one analysis), and each approach has its tradeoffs.
- Chain of custody. Samples are labeled, documented and shipped to an accredited laboratory.
- Analysis and report. The lab reports micrograms of methamphetamine per 100 cm², which is compared with the applicable standard.
Which standard applies
Standards vary. Several states set numeric cleanup levels. For example, Tennessee and North Carolina use 0.1 µg/100 cm² in their frameworks. Other states have no mandatory standard, and the U.S. EPA's voluntary guidelines are the common reference. Some states also say who may collect samples for regulated properties. In Tennessee, a quarantined property must be tested by a TDEC-certified specialist or a Certified Industrial Hygienist. We'll tell you which framework applies, and sampling for regulated properties is done only by appropriately credentialed parties.
Field test kits vs. lab testing
Consumer and field screening kits can give an indication, but they don't replace accredited laboratory analysis when you need defensible results for a transaction, a regulatory filing or a dispute.
Understanding results
We explain results in plain language: what was found, where, how it compares with the relevant standard, and practical next steps. A result below the standard doesn't prove a property was never exposed, and a result above it doesn't mean everything has to be gutted. The numbers guide the scope.
Fentanyl
Fentanyl testing uses different methods and has no established state or federal clearance standard. See our fentanyl surface testing page.