It’s the prosecution’s burden to prove each and every element of any offense beyond a reasonable doubt. Further, here in Texas, the Code of Criminal Procedure says the prosecutor’s job “is not to convict, but to ensure that justice is done”. It’s normally not the number of witnesses, but the weight given to each witness’ truthfulness, memory, etc., that a judge (in a bench trial) or jury will use to either convict or acquit.
I’ll tell you that for the prosecutor, the best thing since sliced bread in failure to yield or failure to stop cases has been digital video. It’s amazing how many people were just certain they’d stopped, but when they see themselves rolling through the intersection, they ask for deferred disposition or defensive driving.
Colonel, USAFR
..and, there I have my answer. In all practicality, you're guilty as soon as the cop decides that you are.
I understand about the full stops too. I have been very conscious of my stops since a coworker got a $400 camera ticket. I stop until the car "settles" backwards, then proceed.