They began as tools in military combat. Now aerial drones are being considered by Bay Area law enforcement agencies as a cost-cutting way to replace helicopters, and use technology to fight crime and save lives.

Alameda County Sheriff Greg Ahern first tested one of these Unmanned Aerial Systems or UAS about a year ago. Now he’s looking into possibly bringing a drone here. His office would be the first in California to do it. Armed with live-video-feeding capabilities and different features, like infrared d