ART.1...The referee may correct an obvious mistake by the timer to start or stop the clock properly only when he/she has definite information relative to the time involved.

How is that defined?

ART.2...If the referee determines that the clock was not started or stopped properly, or if the clock did not run, an official's count or other official information can be used to make a correction.

Anybody know what "other official information" means??