Wouldn't be a bad idea on implementing something into any Car PC that'd allow for the device to be 'tracked'. Though setting up a backdoor would be the first idea, it may not be the best, due to process usage, etc.
But setting up a little script to run on startup that simply GETs a URL on a server which you can see logs on. As then you could may be able to get a subpoena on that IP.
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OMG Ponies