I believe that some police departments take the reasons why applicants fell behind on their bills or have bad credit into account when they consider hiring them. It depends on the department. Some are more strict than others. Probably the departments that are really understaffed and want to hire someone aren't always so picky. However, today many departments can be even more selective than before. You're right that many people aren't able to provide their employer's information from 20 years ago. You just have to do the best you can.