Following the second investigation, Kern was reportedly assigned to. Avery and Finlay conclude that Berman unknowingly made a sex tape. Stone asks Benson to investigate a sexual encounter from his past that he feels guilt and uncertainty about. Franklin and Bash, Don't Trust The B_ In Apartment 23 and CSI: Las Vegas, is an American procedural forensics crime drama CSI: Crime Scene Investigation. With William Petersen, Marg Helgenberger, Gary Dourdan, George Eads.