City health officials say they are holding marijuana products that show pesticides that the state says cannot be used on cannabis.
Denver health officials Tuesday began inspecting and quarantining hundreds of marijuana products because their labels listed pesticides not approved for use on cannabis.
The move comes about six months after the city quarantined 100,000 plants at 11 grow facilities over concerns about pesticides.
Although pesticides are widely used on crops, their use on cannabis remains problematic because no safety standards exist. Marijuana is illegal under federal law, so the U.S. Environmental Protection Agency, which regulates pesticides, has never established any limits.
The Colorado Department of Agriculture, however, has created a list of pesticides it says can be used.
