Im always respectful and say "yes sir & no sir" and everything seems to work out and I'm on my way but I would probably say no sir to a search even though I got nothing to hide. No offense to anybody here but there are probably some cops that will find what they want if they want you bad enough. Sorta like pulling you over for that tail light that seems to be working fine now or that that obscured tag thats been in the same place 20 years or the classic I saw you weave across the centerline a ways back.