In this type case, rather than probable cause, isn't it that they have to be able to "articulate a reasonable suspicion"? Typically, the police just report that they "smelled something" that they suspected there was drugs in the car. When nothing is found and no charges filed, the 4th Amendment violation is usually just ignored by the victim. If they "smelled something" but found a gun but no drugs, the search might get tossed, but don't count on it (and it'll cost, anyway).We don't know that he "let" them search it. My guess is that even if he refused, the officers would've felt they had probable cause.
For the report they were going on (road rage, or erratic driving) there is nothing in the truck for which they could be suspicious of.
We all agree that he should not have consented to a search. This is another reminder that it is good to lock your vehicle even when hopping out to quickly get a sandwich.
Worthy of a separate thread (though it's been discussed) is how to safely get by the trap question, "Do you have any drugs or weapons in the car?" With a legal gun in your car, almost any answer you give that implies "none of your business" will raise suspicion.
--jcr
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