Art,
You are actually wrong about the last part of you statement re the NFL combine laser timing. A participant must achieve a full stop at the line which is indicated by an "all clear" tone to start the 40 (this is laser gate one or zero dependent on which system is used). To achieve this "all clear" you must set up in your stance and achieve a laser tone lock. Once this is complete a tone will sound that signifies you can start at will, upon first movement of any body part the clock will start. This method is much stricter than a hand or partial Laser time such as starting the timer with a plunger or toe peddle release and a laser gate stopping the time. In other words it takes all human bias of the times registered and is often different that what the preliminary reported combine times are at the time of viewing on ESPN.
Really? When did they eliminate the two hand times which are used to determine the final (published) time?