IF you are running in a GAS class your tank has to be sealed prior to your run. The gas vendor has been handling this and it's reasonable to assume that this will continue. If you bring your own gas in a sealed container (like a new 5 gallon can of VP, for example) the vendor can install that for you and seal your tank at that point. There IS a charge for that service. Staff can (and sometimes does) check the tank for an intact seal following a record run.
If you are running FUEL or T/O, or never qualify for a record, no one will check. "Fuel" is anything that isn't gasoline so there's no reason to check. Remember, N2O qualifies as "fuel" regardless of what's in the tank - but if you plan to remove the bottle and make subsequent passes in gas classes remember to keep the tank sealed.
So far there have been no provisions for "Event Diesel" so it's treated like fuel.
All this was true at Maxton and is my understanding of the situation at Ohio. Hopefully Joe or Keith can add in here if I got it wrong.
Dan