The last thing that you want to be sure of when you are dealing with a investigator is that you are getting what you pay for. Do a little bit of shopping around before you hire someone. Also, before your investigator starts to work, you want to be sure that you have sat down with him or her and hammered out what the fees will be, and what that is going to entail. You want to be sure that you have covered all of your basis, and you also have to be sure that if the private investigator is going to do anything that might cost more money, they call you before they do.. The best way to avoid this is to have open lines of communication and to make sure that you know what your private investigator is going to be doing.