It's a sad testament to our police when they arrest somebody for taking pictures. As this editorial points out, why is it okay for a citizen to be photographed but not law enforcement. If the photographer is not hindering the arrest or investigation I don't see what the problem is.
http://seattletimes.nwsource.com/html/editorialsopinion/2015808204_pitts04.html
http://seattletimes.nwsource.com/html/editorialsopinion/2015808204_pitts04.html