Many marijuana growers in states that have legalized recreational or medical marijuana use pesticides, without any federal regulations, according to NPR.
While the federal government tells farmers which pesticides are safe, it has not issued rules on pesticides for marijuana. The drug remains illegal under federal law.
As a result, growers are experimenting with little oversight, according to Colorado State University entomologist Whitney Cranshaw. “In the absence of any direction the subject of pesticide use on the crop has just devolved to just whatever people think is working or they think is appropriate,” he said.”Sometimes they’ve used some things that are inappropriate, sometimes unsafe.”