Let me put myself in the shoes of the Tire Doping Cops. My job is to enforce the rules and bust the culprits.

When teams go to the track, they have to purchase their RR tires there. The tires are subsequently marked and mounted. Seems simple. No time to dope.

Oh, wait.... for the weekly races at tracks, no one (Hoosier, American Racer, Goodyear) are there to mount tires. My plan holds no water. Dope away, men!

But for USAC races..... WoO races.... All Star races....