I don't think he necessarily does anything with his victims' cars, since most of the time he doesn't abduct them there. Donovon in the pilot episode was the only one where he was actually in their car, AFAIK.

So the rest of the time the victim's car would be left behind, along with all their other possessions, with no evidence of Dexter having been there.

As for the cars that he actually uses - well yes, I'm sure there'd be his victims' DNA in his own car as we've seen him use it to transport bodies at least once (Roger Hicks in the minivan's stow and go seating LOL). But most often we know that he uses cars from impound.

And if one of those impound cars was ever identified by someone who has seen Dexter bringing in an unconscious victim - as Rodrigo's neighbour spotted him doing in season 2 - I'm sure there's be DNA in those cars that could be traced back to him. In the case of the car he used for Rodrigo, I'm guessing he got away with it because the car had been sold or disposed of by the PD by then, so they couldn't check for DNA.

BTW - the car thing is actually one of the plot holes for me. I am amazed that only once (that we know of) has Dexter been spotted carrying an unconscious victim to whatever car he's using. I know he's careful,but he can't check every single window to see that nobody's watching him. I can't help but wonder if that part of Dexter's ritual - his desire to set up a separate kill room often in a specific place - will one day be his downfall.

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I still am a bit confused as to who Dexter's first kill was; the nurse or the pimp?

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