I don't know if it still happens at races, but back when tubular tires were what we all rode in races, it was standard practice for a race organizer to deputize people who weren't racing a given event to go down the start line and check whether the tires of the racers were securely mounted.

I was drafted to do it once, and found that about every fifth tire was barely glued. One guy had glued his front tire on just that morning. He whined about it when the official pulled him from the race.