During an electrical storm, Det. Lassiter (Tim Omundsen) brings in a key gang figure but is promptly told he must yield to the FBI, who have agreed to put the man in witness protection in exchange for his testimony. Lassiter is overheard saying he should have shot the man when he had the chance. Then, during a brownout, a shot is heard and Lassiter is found standing over the gang member's body, gun in hand. Suspended, Lassiter turns to Shawn and Gus to exonerate him.
Despite its comedic tone, Psych has always depicted police work seriously. This episode showed the depth of Shawn and Lassiter's dynamic, ending with Lassiter saving Shawn's life.
Kudos to writers Kell Cahoon and Tim Meltreger.