By Steve Elliott
The rules of Washington state's recreational marijuana legalization law, I-502, require a sample tested from every lot of marijuana. But how useful is that testing?
The program is having some success detecting substances like yeast, mold and bacteria, reports Evan Bush at The Seattle Times. About one out of every 10 batches of marijuana fails and can't be sold in recreational pot shops, according to Washington State Liquor Control Board data.
Potency testing, meanwhile -- which measures levels of tetrahydrocannabinol (THC), the primary psychoactive component, shows Washington weed is widely variable. Recreational marijuana averages about 16 percent THC in the state, but about 2.5 percent of samples test above 28 percent.
Laboratory directors from the state's 12 licensed pot-testing facilities said they are forming working groups to lobby the Liquor Control Board for more oversight of lab methods.
"Part of it is to invite more regulation," said Brad Douglass, scientific director at the Werc Shop, one of the 12 labs licensd by the state.
Randy Simmons, with the Liquor Control Board, claimed that the system is off to a good start. "The majority of what's out there on packages is correct," he said.
"The lab side is emerging," Simmons said. "As it matures, I think all those things that have been missed ... or things we find out we should be looking for, will all be changed."