Okay.. let me put it this way.
Sooner or later, if it's not regulated and curtailed, you'll be able to get the nifty little drones like we saw in Dark Angels wwaaay back in the last decade. What does this mean.
Well you'll have an autonomous patrol of automated drones (or monitored drones from a central loction) who might or might not have cameras, and/or weaponry. AS the tech improves, (specifically range, distance, responsiveness and autonomy (for 'black out periods)) you are going to find drones becoming more and more common.
With the introduction of off the shelf components, plug and play software and control systems, you have a veritable nightmare of security issues. Terrorists won't need suicide bombers.. they'll fly these. Paparazzi will gain a new method of tracking their targets. Police men might or might not have new methods of investigation, patrol.
Note.. aside from weaponry.. almost NONE of the material to create the small 'smartphone' driven drones is illegal to possess. Growing in scale to the manhole cover sized drones of 'Dark Angel'