I think you guys are reading way more into this story than actually exists. In the original story it looks pretty clear that there were eyewitnesses who were able to report the actual license number of the car. The cops seem to have asked for the GPS data to locate the car after the hit and run. So what?
A major crime was commited with an automobile, an innocent life was taken and the driver needs to be brought to justice. Hopefully the car was located so that evidence could be gathered. It sounds like it was found and the forensic evidence should be pretty clear. The court case against the guy will be won or lost based on the evidence: was the car involved in the hit and run, was the supposed driver actually driving the car at the time (maybe it was stolen), can the eyewitness reports stand up to scrutiny in court, etc, etc. Relax guys. Nobody is asking for YOUR GPS data!