I wonder if it will be more accurate than an officer's eyes.

Those eyes are not always the best. I was pulled over once for talking on my cell phone. I told the officer that I had not been using the phone (which was only for emergencies, and was buried in a backpack). He argued with me pretty forcefully, until I invited him to check the call-list. My guess is that I was rubbing my ear at the instant he glanced at my car going by.