Washington DC Wins the Photo Enforcement 2014 Award Surpassing Chicago

DC photo enforced map
Washington DC - Speed Cameras, Red Light Cameras, Crosswalk Cameras, Stop Sign Cameras & Toll Road Cameras
Chicago photo enforced map

Washington DC has surpassed Chicago this year as the most densely populated photo enforced city.  They no have by far the most speed cameras, stop sign cameras and red light cameras per capita.   Chicago can definitely thank Rahm Emanuel for the huge increase in camera activity.  Who does Washington DC have to thank for the increase in cameras?    Which states allow speed cameras?