"Since the two components are not explosive until mixed, they can legally be purchased in the USA without a license. Combining the components constitutes manufacturing explosives.Once mixed, the components are an explosive and it is illegal to transport these materials on public roads in a vehicle without proper insurance, packaging and placarding. Storage of the mixed Tannerite is also prohibited unless stored in approved magazines."
"On January 14th 2008, a man in Red Wing, Minnesota was accused of detonating 100lb of Tannerite inside the bed of a dump truck by shooting it with a .50 caliber rifle from 300 yards away. The ensuing blast could be felt at Prairie Island Nuclear Power Plant, and officials from the FBI, BATF, Nuclear Regulatory Commission, US Postal Service, and the US Coast Guard became involved, along with local law enforcement agencies."
"The man, Brian Wesley Childs, was arrested for gross disregard for human life and destruction of property with an explosive or incendiary. Childs has since pleaded guilty to detonating an explosive device and unlawful possession of components for explosives, for which he was fined $2,583 and sentenced to three years' probation; the charge of disregard for human life was dismissed."
Just be careful!