just tell them no they dont smell anything and that you DO NOT give them permession to search your car! most cop make shit up so they can search you car with the hope of finding something, so if you say no and they were messing with you they will probably leave you alone, if they really think you have something there will get a drug dog out there then your screwed! as for cops being able to do anything they want, they can, but they still do cause there no one thats going to stop them so be careful, they dont always obey the laws themself! i one had a cop tell me to get out of my car cause he wanted to kick my ass! he didnt like that i told him i hoped he died today! so i said fuck you im not getting out and i drove away(he already had givin me my ticket) i peeled out right in front of him and gave him the bird!