He is not required to answer questions, especially about his destination or what he may have consumed.  He only needed to ask, "Officer are you REQUIRING me to testify against myself?"  If the answer is "yes", it's a clear 5th Amendment violation and possible lawsuit.  If the answer is "no", then do not answer questions.  Provide license and registration if asked.  Do not answer questions or unlock the door.  Don't make statements or cite laws or rights.  The only legitimate reason for you to talk is to ask the simple questions, "Am I being detained?" or "Am I free to go?"  They either have to let you go or make up a false reason to detain you, which is another possible lawsuit. 

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