LOGLINE: Shawn and Gus must prove Lassiter's innocence when he's on the hook for a murder inside of the SBPD.
SYNOPSIS: There is a thunderstorm in Santa Barbara that has been causing the electricity to flicker on and off, but that doesn't stop Lassiter from making the bust of his career. Five years ago, he arrested Ernesto Chavez, second in command of the Cinco Reyes street gang, but the D.A. couldn't make the charges stick and Chavez disappeared. This time around, they've got enough hard evidence to get a conviction, something that Detective Drimmer and his gang unit has been unable to do. Everyone turns to watch Lassiter bring in Chavez, who glares at McNab as he walks by. Lassiter, then, hands off Chavez to be processed and put in a cell as he is called into Vick's office where the FBI is waiting for him. Lassiter is furious to learn that Chavez cut a deal with the Feds and will be entering a witness relocation program, thus avoiding prosecution. Vick orders an angry Lassiter to retrieve Chavez from his cell and turn him over. He leaves and the lights flicker out once again, only this time a shot is heard in the darkness. The lights come back on and everyone runs down to the holding cells to find Lassiter standing over a dead Chavez with a smoking gun in his hands.
Shawn immediately notices that Lassiter's finger is not on the trigger of his gun, a service door is ajar and an overhead light remains off. Lassiter tells Vick that when the lights went out, he was accosted from behind and lost his weapon. The gun discharged, the lights came back on and he saw Chavez dead. He was picking his weapon back up when everyone arrived. The FBI doesn't believe Lassiter's story, but Vick sides with her head detective and orders Juliet to lock down and search the building. But, following protocol, she also insists on running ballistics and fingerprints on his gun, and getting a full written statement. After Juliet tells Vick the search turned up nothing, Detective Ocampo from Internal Affairs questions Lassiter who is shocked to hear he's a suspect as his hands are checked for gun shot residue. Shawn assures Lassiter he believes in his innocence and the next day Chief Vick shows up at the Psych office asking him to prove it. Ocampo got a hold of Madeleine's psych evaluation of Lassiter and things don't look good. She asks Shawn and Gus to join the search of Lassiter's apartment to see if they can find anything to vindicate him. Things go from bad to worse as they find an obsessive array of mug shots and notes on criminals covering one wall, plus the GSR test comes back positive and the bullet that killed Chavez was matched to Lassiter's gun. That's all that Ocampo needs to hear, and Vick is forced to place Lassiter on suspension and confiscate his badge.