I don't know all that. I read through Lonnies replies and one triple crown driver posted that one of the labs that USAC went too was very expensive and has a outstanding reputation that their findings had stood up in court several times and that the cost was probably why it wasn't used in the first place.

Also that Tires are made in batches and have some softening compounds in them when made. If four teams got four tires from a batch a guy put a half cup too much chemical B into one batch and not the others That could show up as a Annomily to the baseline. But not a known cheating chemical

Some teams will buy as needed, Some buy a dozen at a time. Would be nothing for a team to have a tire on that was made two years ago, but not used till it matched the Left rear they were using at the time for the stagger they wanted. Thats what all the crayon is on tires . 96.5" 95.6 could be the same brand, size and compound but thats what it measures mounted and aired.