Powder-like substances greater than 12 oz. / 350 mL must be placed in a separate bin for X-ray screening. They may require additional screening and containers may need to be opened. For your convenience, we encourage you to place non-essential powders greater than 12 oz. in checked bags.
“The TSA’s new scrutiny about powders in carry-on luggage stems from a foiled plot to blow up a passenger plane in Australia,” according to this article written by Rene Marsh and Madison Park for CNN. “The would-be attackers planned to place the improvised explosive device on an Etihad Airways flight last July, but the device didn’t get past the airline’s check-in desk.”
Powders in carry-on bags may require secondary screening; and if the powder cannot be cleared by officials of the security checkpoint at the airport, it will be prohibited from being carried into the cabin of the aircraft.
Powder-like substances are described as fine dry particles produced by the grinding, crushing or disintegration of a solid substance — with flour, sugar, ground coffee, spices, powdered milk and cosmetics as a few of many examples.
Certain powders will be exempt from secondary screening — including but not limited to baby formula, medically necessary powders and human remains.
For passengers who are departing from the United States or its territories, the Transportation Security Administration has already implemented procedures for powder-like substances at security checkpoints.