Rico McClinton

Sam, working undercover as a bomb specialist, tries to help the team find stolen explosives.

Vaughn is told to keep tabs on his wife's activities, then he finds out the shocking truth about his mother-in-law (Peggy Lipton); a monk (David Carradine) discloses the identity of the "Passenger" to a stunned Sydney.

The team is stunned when Delko is busted for purchasing marijuana. However, as the truth as to why becomes clearer, Horatio must fight to keep Delko at CSI. Meanwhile, after a suspected drug lord is gunned down in his home, evidence leads the CSIs to a dirty bounty hunter whose greed may have gotten in the way of bringing a criminal to justice.

After an explosion rips through a small town school, the team must track down the bomber before another attack occurs.