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Why did they stop him? How did the canine unit get involved?
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The police had a valid reason for the stop, which was traffic related. An unregistered car cannot be driven, so they are entitled to impound it. They already had a basis to arrest your son, so they could impound his car and its contents incident to that arrest and then get a warrant to search the car and the phone. All of that would appear to be proper if all was as you said.
There is a fairly recent US Supreme Court case, Rodriguez v. United States, however, which holds that police cannot unreasonably extend a traffic stop for the sole purpose of bringing in the canine unit. So the issue of whether the police violated your son's 4th Amendment rights would depend on what how long he had to wait for the dog to arrive.
As a result of the possibility that his constitutional rights were violated, he would be entitled to a pre-trial suppression hearing to look into issue if he wants to fight the case and take it to trial. If he wins that hearing, any drugs recovered from his vehicle as a result of the illegal search could be suppressed.