Craigslist Scams

Craigslist is a great place to sell things,but lookout for scams always! Here is a counterfeit check that was sent to a person for a 800.00 item. This is really a pretty good forgery,and would fool a lot of people. Remember if it seams to good to be true IT IS! I called the United States Gymnastics Federation and talked to their accountant. She told me this has been happening for years. So what she has to do now is weekly send a copy of her check register to the bank so that they know which ones are real and which ones are fake. My question is why can't law enforcement bust these guys?