I have a friend that runs a property management company, ACH services, and she recommends that I get bank account information (they can black out the account number as long as their name is on the bank info), pay stubs, employer reference letter, previous address or land lord. All of these methods are free and she was told by the edmonton police service that this is the best way. Or you can pay to find out their credit info, which is also a good option.