Targets of Obsession - S11-E15
Continuity mistake: When Justin Bieber gets shot, we see him from the back as he falls back, and his left hand is flailing around with no gun in it. We then cut to him from the front falling backwards, and he's holding the gun in his left hand the whole way down to the ground.
A Kiss Before Frying - S11-E12
Continuity mistake: Near the end when Greg meets Rita at the bus station, she puts her arms around his neck. The next shot from the front shows her arms and hands on Greg's chest. Rita's arm/hand position changes continually throughout the scene.
Blood Moon - S11-E3
Continuity mistake: When Nick is talking to Catherine about what happened at the night of the murder he folds his arms. In the next show they are unfolded. Although you can't see his arms entirely, it becomes clear from the position of his shoulders and the wrinkle in the middle of his shirt that instantly disappears.
Hitting for the Cycle - S11-E18
Continuity mistake: Series 11, Episode 18, "Hitting for the Cycle": At the very beginning of the episode they are talking about the cycle while looking at the board. The three main ones, Suicide, Accidental and Homicide, are together on cards with a space above and then two more cards. The scene then goes out to show the CSIs again, and there are now four cards grouped together on the board.
Targets of Obsession - S11-E15
Continuity mistake: Watch the back angle of McCann getting shot. His gun disappears only to reappear in the front angle.
Continuity mistake: Season 11 - Episode 20 "Father of the Bride." As the doctor's wife is sitting talking with Nick about Vegas being the fugitive capitol of the world, watch her hands. At first they are spread far apart on the table. The shot changes and they are suddenly crossed in front of her.
Answer: He doesn't have the authority to arrest him - when anyone is arrested in the show, a police officer does it. Also he tells Ty that he is going to be submitting his case findings to Ty's insurance company, who would no doubt contact the IRS, who then would have him arrested for fraud etc.