crimestoppers is police organization that show cases criminals on tv then asks views to call in if they can help locate that criminal. when you call in crimestoppers assigns you a case number which is a bank account number. if your call results in crimestoppers arresting the show cased criminal, crimestoppers deposits money in the bank account. you take that number to the bank, the bank takes the number looks it up on their computer and verifies its a valid account number and that there is money in that account. then the bank with draws the money and gives you the money.