When I sent you my answer, the "already tried" section of your post did not display. I spotted it after I sent off my response. It doesn't change the botXXXXX XXXXXne in that as each fact after a stop can form the basis for a continued stop and for additional searching. And the constutionality of the whole process still gets determined on an individual case basis at a pre-trial hearing designed to challenge the stop.
In your matter, the initial traffic stop gave the sheriff the right to approach the vehicle. From there the dog gave him probable cause
to think that there were drugs in the car. That would allow him to have your wife exit the car and to search the vehicle. From there, he obtained a warrant, from what you say. That's a whole different ball game. A judge had to sign off on if he or she was given enough facts to think there was probable cause for the search to continue. I don't know the scope of that warrant. That would e tested at the same hearing.
He may be keeping the car to wait for an additional warrant. Under some situations that could be proper. He may be holding the car as some kind of evidence as instrumentality of a crime. I don't know if he's behaving properly or improperly, only that there are certainly issues that can be challenged to find out.
On the other hand, if he never did your arrest wife, and she was ultimately free to leave the scene and he's still holding on to the car, contact a local criminal
lawyer or your public defender's office and see if you can get someone to call the sheriff and find out just what's going on. Don't do it yourself. If you and your wife are both under suspicion because the dog thinks the car has been used to transport drugs, this may be just the beginning of your dealings with local authority, and anything you would say to the sheriff could be used against you and your wife.
If you're not under an active investigation
and the sheriff still will not release the vehicle, you will need a local civil lawyer to help you get this car back. In an extreme case you could sue the sheriff's office to get your car back.
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This is informational only and is NOT legal advice. There is no attorney-client relationship. You are advised to consult an attorney in your state for specific legal advice.