With their respected colleague Josh Folsom under arrest for the death of Kahn Schefter - the man responsible for killing Folsom's mother - the CSI team combs through every crumb of forensic evidence to determine his innocence or guilt. With a new piece of evidence at play, Catherine Willows reopens an investigation from her past that never got solved after a violent attack left her hospitalized. Internal affairs begins questioning Folsom.

CBS續訂《犯罪現場調查：維加斯》第三季。 隨著他們尊敬的同事喬希·福爾索姆因殺害福爾索姆母親的兇手Kahn Schefter的死亡而被捕，犯罪現場調查小組梳理了每一點法醫證據，以確定他的清白或有罪。 有了一項新的證據，凱瑟琳·威洛斯重新開始了對她過去的調查，在一次暴力襲擊導致她住院後，這項調查一直沒有得到解决。 內務部開始審問福爾松。