WASHINGTON (CBS) — A change in TSA screening policy may mean that some air travelers won’t be able to opt out of full-body scans at airports.

CBS News reports that the Department of Homeland Security has quietly updated procedures for Advanced Imaging Technology at airport security checkpoints.

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“While passengers may generally decline AIT screening in favor of physical screening, TSA may direct mandatory AIT screening for some passengers,” a document from Dec. 18 states.

Officials cite “the need to respond to potential security threats” as one reason behind the change.

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The body scanners have been criticized in the past for being “virtual strip searches,” but new technology shows screeners a more generic figure instead of a person’s individual body type.

The image shown by body scanners (Image credit TSA)

The image shown by body scanners (Image credit TSA)

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CBS News notes that a full-body scan can pick up non-metallic explosives, which is terrorists could use to try and bring down a plane.