Michigan Rep. Mike Mueller introduced a bill (HB 4501) to establish a statewide cannabis reference laboratory, which would standardize testing across the state, audit the results of existing private labs to prevent "lab shopping," and ensure tighter safety controls in the cannabis industry.

Michigan Lawmakers Move to End "Lab Shopping" and Keep Testing Honest with New State Reference Lab

Jan 18, 2026

Source:

Marijuana Moment

Michigan is looking to step up its game when it comes to keeping our bud clean and consistent. State lawmakers are currently moving forward with House Bill 4501, which would establish a dedicated state-run cannabis reference laboratory. Right now, testing is handled by about 17 private labs, but there’s a sneaky practice called "lab shopping" where some growers bounce from lab to lab until they find one that gives them the highest THC numbers or ignores a bit of mold.

This new state facility isn't meant to take over all testing, but rather to act as a watchdog. It will audit private lab results and handle internal investigations to ensure everyone is playing by the rules. For everyday tokers, this is a massive win for peace of mind. Knowing that a central authority is standardizing these safety checks means we can trust that what’s on the label is actually in the jar. It’s all about ensuring that the community has access to safe, high-quality flower without the worry of manipulated data or hidden contaminants.