There has been a large recall of pot grown in Colorado leaving users to wonder if their weed is tainted with  an unapproved pesticide.

According to the Denver Post, the recall affects a large amount of marijuana grown in Denver from as far back as March of 2014 to as recently as January of this year. The plants were grown in Denver but were distributed to outlets statewide and could have found their way to the western slope.

At question is a widely used insecticide that has not been approved for use on marijuana. The pot-growing company denies using the pesticide and is contesting the recall.

Consumers that have any of the recalled products including flower, trim, concentrates, and infused products like edibles, should return them to the place they were purchased to be properly destroyed. The license numbers of products affected by the recall found on the label are 403R-0008 and 403R-0009.