First you need to be sure you retain the services of a reputable, honest licensed detective agency. Make sure they are well established with a track record. Check to be sure they are fully licensed and insured. Do they answer the phone with a live person or do you get lost in voicemail box? Check with the Better Business Bureau to be sure there are no complaints about the company. Last of all do your own “gut check” about the agency you are talking to. Do they make you feel at ease? Are they using pressure tactics and hard sell techniques?