Resisting Arrest, or Assaulting a Police Officer. In many cities, (I believe DC, for example, is promenantly know for this), many people are charge solely with assaulting an officer. One would be led to believe that there are thousands of wreckless citezens wantonly assaulting the police, if one did not realize that this was a euphemism for declining to censent to be searched, or "getting lippy".
EDIT: Why the downvote? Can't handle the truth? Here's some evidence that, at least in DC, the law is used to effectively arrest people for resiting arrest, with no other charge:
"Nearly two-thirds of those arrested [in the District of Columbia] for assaulting an officer weren’t charged with any other crime, raising questions about whether police had legal justification to stop the person."[1]
"In Coghill v. United States, 982 A.2d 802 (D.C. 2009), the court upheld a conviction for misdemeanor APO. Mr. Coghill was stopped by police while driving a car, and refused to let police search his car. He then got out of the car at their instruction, but at some point got back in the car. Officers tried to drag him out of the car, but he braced himself against the floorboards and gripped the steering wheel."[2]
"On Tuesday, Ward 3 DC Councilmember Mary Cheh introduced a bill to reform some elements of criminal justice procedure. It would change the law around "assaulting a police officer," strengthen prosecutors' duty to turn over evidence to defendants" [3]
[1] http://wamu.org/projects/assault-on-justice/
[2] http://greatergreaterwashington.org/post/10619/assaulting-a-...
[3] http://greatergreaterwashington.org/post/26688/mary-cheh-wan...