For the fourth time in less than a week state marijuana regulators have issued a health advisory and recall of pot over concerns it is contaminated with potentially dangerous pesticides not approved for use on the crop.

Wednesday’s order by the Department of Revenue’s Marijuana Enforcement Division involves 68 batches of medical pot grown since December 2015 at Rocky Mountain Organic Medicine Inc. in Denver and sold through its dispensary in Golden.

The agency did not disclose the number of plants and products derived from them that are impacted by the recall, but said consumers should not dispose of them. Rather, they are urged to return them to the place of purchase.

Officials said the plants had tested positive for two pesticide chemicals, myclobutanil and spinosyn A, neither of which is allowed to be used on commercially grown marijuana in Colorado.

Owners of the business did not immediately respond to calls on Wednesday.[Read more at The Cannabist at The Denver Post]