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.
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.