The Sixth Amendment protects the people's right "to be confronted with the witnesses against him." You cannot confront a machine, nor compel the machine to appear in court to be cross-examined. A machine does not accuse, nor offer testimony.
I suppose the red-light camera would be okay if it were paired with a police officer at the same site to witness the infraction and then corroborate the photo taken by the machine as evidence, but then that would defeat the purpose of the machine in the first place.
-PJ
So, you would be against convicting the monster that was sniping out of his car trunk based upon a video that showed them firing on the public because it would abridge their civil liberties since no human saw them? Please. Go back and read the spirit of the law.