Do they have to go through the scanner? Device manufacturers generally advise getting a pat-down and having the devices swabbed - but this is advice for travellers rather than employees.
I would imagine a degree of shielding around the devices, to ensure the scan is directed mostly internally? But that might just be wishful thinking. Is there a workaround where they don’t have to go through the body scanner? Archway ones are generally fine I think?
And in part seems to be because device manufacturers don’t want to commit to checking their devices in any and all variants of airport / library / security scanners that have ever existed, or may be launched in the future. So rather than say it’s fine, or probably fine, (and then be liable if anyone got into an emergency situation on their way overseas because their tech got fried at the airport) it’s easier for them to get the person to ask for a pat down.