I have reliable information that for about the last year, the California Highway Patrol (CHP), the third-largest law enforcement agency in the United States, has been seriously studying the feasibility of operating small AUV's and has been testing several models. My guess is the most likely candidates are the ubiquitous DJI Phantoms and perhaps the Yuneec Typhoon H and/or Q500 as well. Cautious of the recent feverish public concerns surrounding potential UAV privacy infringements, the CHP steered cleared of such studies for the last half decade; however, they have apparently now opted to reconsider that stance. Many other law enforcement agencies in California have been using UAV's for several years now, consistently touting great success in documenting crime scenes and complex, high-profile traffic collision scenes. I suspect that will be the absolute limit of the CHP's use, which will be thoroughly restricted by departmental policy. As an aside, I am unaware of any state or local law enforcement agency using UAV's for surveillance purposes, which would likely be a slippery slope; there's nothing like having your name attached to bad case law, eh? I suspect the CHP will ultimately purchase a small fleet of UAV's and assign one or two to each of their nine Multidisciplinary Accident Investigation Teams (MAIT), elite teams of highly-trained collision investigators who investigate and reconstruct the most severe, complex collisions and document other high-profile crime scenes.