Generally BC races are run under UCI regs – so for road racing at least they could get fussy about it. Doubt they will though, seems ridiculous!
Only time my bike has ever been checked was before some of the crit races at the old Eastway Circuit. I’d ride up there and there’d be someone there saying “you need to get your bike checked before you can sign on”.
He’d then hand your beautiful bike to a gorilla who’d hang himself off the bars, twist everything violently and then point with pride to how your STI’s had moved by 3mm.
“They’re loose, go get them sorted or you can’t race”
Should your bike manage to get through the beating, you’d be given a little numbered disc to hand in at sign on to prove you had a safe bike.
Thankfully that practice seems to have stopped now.