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Langston and Nick are called to investigate a murder at a fast food restaurant and have quite a task ahead of them when they discover that much of the evidence is coated in cooking oil.
When an FBI agent who was working undercover is found brutally murdered, the CSI team is called in to assist the victim's partner in finding the killer.
While Langston testifies in the trial of a respected Congressman, new evidence sends the CSIs back to the lab to reopen the investigation.