Continuity mistake: After Natalie lowers the car onto Sara Sidle we know her right arm is pinned and she cannot move it. When Sara hears the coyotes she starts to look around and see where they are coming from. At one point we can see Sara with her right arm inside the crashed vehicle. (00:22:25)
Continuity mistake: In episode 8-1 Dead Doll: When Warick finds the zip-tie in the trunk it is not looped, when he holds it up for Grissom it is looped. He would not have looped it himself.
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.