|Original Airdate||May 20, 2004|
Bloodlines is the twenty third episode of season four of CSI: Crime Scene Investigation
The CSIs investigate when a casino employee is beaten and raped on her way home from work. The victim identifies her attacker, but the DNA evidence suggests that he is not the person responsible. Later, Grissom has to help out a coworker who ends up on the other side of the law.