BUTTE, Mont. (AP) — Know your customer.

That guidance might have helped a Butte man who was arrested over the weekend after reportedly offering to sell marijuana to an off-duty police officer.

Butte-Silver Bow Sheriff Ed Lester says 32-year-old Leroy Hopke approached the officer and his wife as they left a store on Friday night. The officer declined the sale and called on-duty police officers from his vehicle.

Police arrived and arrested Hopke on suspicion of possession of dangerous drugs after finding 11.7 grams of marijuana in his possession.

Lester said Hopke was undone by an “unfortunate marketing situation.”