Never got the answer to the quanity thing. Could be Homeland Security feds as well, some county reg as well. Reguardless, local pd used the powder for "training". Tails of the unlikely. Sure glad I checked out of that place. Still, might be a good question on the fed level for those of us in other states. Think a house hold propane tank or a set of welding tanks would hold much more of a hazzard.
Chris