The 12th season of C.S.I. debuts tonight on CBS at 10 p.m. Eastern. Benson and the team must determine if the woman was attacked or if it was a night of alcohol, drugs, and sex. CSI puts the power of clear, actionable, high value investigative information in your hands – efficiently and affordably like no other investigative firm. Stone asks Benson to investigate a sexual encounter from his past that he feels guilt and uncertainty about. Service provided to the State does the Criminal Investigations Division is comprised of eight specialized units staffed by 35 investigators and six civilian employees whom investigate all manner of.