You Kill Me - S8-E8
Continuity mistake: In Episode 8-08, "You Kill Me," when Archie takes the first kilo of cocaine out of the case, he takes the bottom-most left-most kilo. When he takes out the second kilo, he removes the same package with the empty space being two to the left of the one he would have removed.
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.