Continuity mistake: In the Season 8 episode "Goodbye & Good Luck," near the beginning, Sara and Warrick bump into each other and Warrick drops his medicine. During their conversation, Warrick squeezes Sara's shoulder and then drops his hand. The shot instantly cuts to a view from behind Sara and Warrick's hand is back on her shoulder with no time (or reason) for him to have put it back.
CSI: Crime Scene Investigation (2000)
1 mistake in Goodbye and Good Luck
Nick Stokes: There's a sucker born every minute.
Gil Grissom: Yep, and they all come to Vegas.
More trivia for CSI: Crime Scene Investigation
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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.