the new york city police department tested this out last year. they put cameras on some of their police officers and noticed right away that complaints on officers and the use of force fell dramatically. the question is, should other police departments also follow suit? take a listen. >> basically, this is the camera device. >> reporter: in rialto, california, police officers are wearing tiny cameras on their uniforms to monitor dealings with the public. >> it's tethered with a battery pack. the battery pack allows us to operate the camera. there were 54 officers involved in the experiment. it does all the audio and video recording. it is stored inside here internally. it cannot be manipulated, turned off, changed in any way. >> reporter: now that stops, searches and arrests are being filmed, rialto's police chief says complaints against officers has dropped 88% from 24 complaints last year to only 3.