An article in Government Computing News has reported that despite the UK government’s desire to trial the technology, officials at the London Underground believe it has too many serious drawbacks to be a practical measure.
Principal among these was the issue of time. London Underground officials are believed to think that because many users of the underground depend on its speed, introducing a labored scanning process would defeat the point of the service entirely.
Other concerns involved the size of the scanners and the fact that their introduction would inevitably create bottlenecks, effectively producing entirely new targets for terrorists.