Colorado begins mandatory testing of edible marijuana potency

DENVER - For the first time, makers of marijuana-infused cookies, cupcakes and candies were required to submit samples to newly licensed independent labs for testing, starting Thursday.

If an individually packaged product exceeds the legal limit of 100 milligrams of THC — marijuana's major psychoactive ingredient — it is supposed to be blocked from reaching recreational store shelves. Manufacturers can fix the problem or destroy the batch.

But the debut of mandatory potency testing for edibles did not come without problems.

Only two labs were cleared to start testing Thursday, and even those have yet to be fully certified. The state postponed another test that was supposed to begin, and edibles manufacturers are concerned about a lack of standardization and results that are all over the map.

State officials acknowledge testing will not be perfect at the start.

Learn more about the labs and when testing will begin on recreational marijuana in the Denver Post.