[mrjetguy]

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if you say no to a search and they still do it, they have to throw out any evidence in court because they collected it illegally right?

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They would have to have just cause, most of the time this means they would have to see something that is illegal in your car. Basically, just say no you can not search my car. If they end up searching you have a lot more legal recourse than if you say yes.