Even where they do, just because a product passes the state requirements, doesnt mean its clean.
Knowing the grower/producer and what their practices are is the best first step.
Many cultivators and producers (at least in legal States) are willing to provide tours to interested parties.
Being educated on lab testing practices is another great way to learn which labs produce reliable results.
Many labs also offer tours.
Do the chemists at the lab have any prior experience testing for pesticides and other contaminants?
Pesticide Testing| Cannabis Safety Institute viaThe Atlantic
Photo byBrett Levin.