The tire "sniffers" are just Hydrocarbon detectors that are nowhere near accurate. The only real full proof way is to send a tire in for chemical analysis from a lab. Very costly for any track/sanction to do.

My personal opinion is to make soaking legal. It's cheaper for a low dollar team to soak a tire and get more life out of it than it is to go buy a new tire. I don't think making it legal in Sprint Car racing would be the way to go with the mandatory right rears, but in other sanctions like Modifieds & Late Models where there are multiple compound choices, it should be something just given up on teching.