A woman flying for the first time in 15 years was flagged by airport security during a scanner check due to perspiration. She wore bike shorts and normal underwear, having no medical devices. An explanation from another traveler noted that sweating could lead to false alarms. Airport security expert Shawna Malvini Redden explained that moisture affects scanner technology, causing alerts. Unlike the USA, France and Germany have discontinued using scanners that respond to such issues, indicating ongoing concerns about false positives in the US.
Perspiration is probably the weirdest thing that can set off the scanners. It has to do with millimetre wave technology and how the waves bounce off water.
France and Germany have actually stopped using the type of airport scanner that reacts to swamp crotch, as they cause so many false alarms.
Tight and non-breathable materials are much more likely to make you sweat, so you might want to avoid them at the airport if you want to swerve the 'swamp crotch' issue.
Body scanners can also be set off by thick hair in a bun, body piercings, hair clips and wire supports in bras.
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