The electrical kind.
"U.S. Customs and Border Protection (CBP) seized thousands of hair dryers
recently that were determined to constitute a “substantial product hazard”
under U.S. law, for failing to have adequate immersion protection," DHS
announced. "The potentially dangerous hair dryers were identified through a
nationwide targeting operation by the CBP Import Safety Commercial Targeting
and Analysis Center (CTAC)."
http://campaign2012.washingtonexamin...-dryers/376786