: Grissom discovers that Thayer sprayed his experimental subject with malathion, a pesticide that delayed the flies' development by four days. By proving this "clock tampering," Grissom gets Thayer arrested for perjury and obstruction of justice. Key Cast and Guest Stars
: Gil Grissom is summoned by Conrad Ecklie and Undersheriff Jeffrey McKeen to refute the testimony of Mark Thayer, an independent entomologist. Thayer’s experiment with blowflies suggests a timeline that would provide an alibi for a murder suspect. Grissom, however, suspects Thayer has manipulated the science to achieve favorable results. Case Resolutions
: The trail leads to Kenli Johnson, a woman whose mother, Sandra Walkey, ultimately confesses to the murder. Sandra killed Christina to ensure Kenli would gain custody of Joey, as Kenli was the biological mother who had lost her son in a previous custody battle.