BUTTE, Mont. -

Law enforcement officers in Butte are investigating an inefficient and poorly executed counterfeiting effort.

Butte-Silver Bow Undersheriff George Skuletich says someone used seven fake $1 bills to make a purchase at Hastings over the weekend. Employees discovered the fake cash when they were counting the money.

An inmate at the Butte Pre-Release Center also tried to use a fake $1 bill to buy a pop from a vending machine on Tuesday.

Authorities more typically deal with fraudulent $20, $50 and $100 bills.

Skuletich says the fake cash is softer than real money and while the counterfeiters put different serial numbers on the bills, they aren't cut evenly.

He adds that counterfeiting $1 bills "just doesn't make a whole lot of sense."