content: Yes, you can be detained without being arrested. All traffic stops are detainment. You do not have to answer questions while being detained.  While operating a motor vehicle you must provide a driver's license or identification. If you don't you can be arrested or ticketed.  You also must identify yourself if suspected of criminal activity.  This is why he asked for but did not demand identification.  However once she began obstructing (a crime) him in lawfully towing the vehicle he could demand identification. This website provides pretty good information about what your rights and options are during various police interactions: http://www.flexyourrights.org/