Keep in mind, a highway patrolman can search your vehicle if he even suspects drugs or weapons in your car. So why didn't they send out an all points bulletin to search for Westerfield?
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Most likely because there is a VERY good chance a trail judge would find they had insufficient evidence to get a search warrant at that time,and throw out the search and all the evidence found during it. That's assuming they could even find a judge willing to give them a search warrant allowing them to run a mobile crime scene lab through the motor home at that time.