(NewsNation) — Travelers have been warned to avoid packing certain hair tools in their checked baggage.

The Transport Security Administration rule made headlines this week, but NewsNation has learned it has been in place for quite some time.

"Cordless curling irons that contain lithium metal or lithium-ion batteries or are gas- or butane-fueled are only allowed in carry-on bags," a TSA spokesperson told NewsNation.

"A safety cover must be securely fitted over the heating element. The device must be protected from accidental activation."

TSA pointed NewsNation to its "What Can I Bring" page for a detailed list of items allowed in checked luggage and carry-on luggage.

It follows a new “Families on the Fly” campaign launched by TSA last month to “enhance hospitality for families during t

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