Verbally asserting your rights or non-cooperation, while being physically non-threatening and compliant, is the right solution, generally. "No, officer, I do n

Verbally asserting your rights or non-cooperation, while being physically non-threatening and compliant, is the right solution, generally. "No, officer, I do not consent to a search of my vehicle.", said repeatedly, makes it much more clear in court later that the search, which may have been conducted without reasonable suspicion, was also done without consent, and thus the evidence is inadmissible. You're still probably going to jail if they find a suitcase of contraband while searching the car, but jail > conviction.