In a track meet, how are false starts detected?

@moneymind (10524)
Philippines
February 19, 2007 10:53pm CST
Research has found that a reaction time faster than one-tenth of a second is impossible for a human, and the runner is therefore deemed to have anticipated the gun. Under current international rules, a sprinter is allowed one false start without penalty; the second false start results in disqualification. How are false starts detected? greetings. : )
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