In the episode "Trust" the police go to the photographer's studio and begin looking through his digital camera while asking if he knows Abby. The female officer looking at the camera goes through the file "deleted photos" on the camera and sees photos of Abby. If the photographer was guilty of any crime against Abby, the police just ruined the ability to charge him with it, as they had no warrant to look at his camera and he did not give them permission to look through it.