Tighter regs proposed for pesticides used on Colorado pot

Colorado regulators have proposed rules that would further restrict which pesticides can be used to grow marijuana to those that are least harmful and are already allowed on crops intended for human consumption and tobacco.

Deep dive: Why Colorado has struggled to regulate pot pesticides

State regulators have known since 2012 that marijuana was grown with potentially dangerous pesticides, but pressure from the industry and lack of guidance from federal authorities delayed their efforts to enact regulations, and they ultimately landed on a less restrictive approach than originally envisioned.

Extracts company Mahatma to start testing pot for pesticides

Extracts company Mahatma to start testing pot for pesticides

After Denver Post lab tests last week found residual amounts of non-approved pesticide chemicals in concentrated marijuana products made by Mahatma Concentrates, the Denver company has started to test the cannabis it takes in from other pot companies, according to Mahatma leadership.

California pot products seeing big safety testing failure rate

Nearly 20 percent of marijuana products in California have failed tests for potency and purity since the state started requiring the checks on July 1, a failure rate some in the industry say has more to do with unrealistic standards and technical glitches than protecting consumer safety.

The Weed in Weed: Miley Cyrus goes retro and other marijuana photos

Are there risks from secondhand marijuana smoke?

The study found that in rats, the same physiological effect occurs after inhaling secondhand smoke from marijuana as with cigarettes. And, the arteries take 90 minutes to recover compared with the 30 minutes with cigarette smoke.

Photos: California launches legal recreational marijuana sales

At Harborside dispensary in Oakland, founder Steve DeAngelo used a giant pair of scissors to cut a green ribbon, declaring, “With these scissors I dub thee free,” before ringing up the first customer at a cash register.