1. You can't trust them to not save the images and use or accidentally leak the images later, some scanners in courthouses were found to be saving images.
2. It's not reasonable to require knowledge of everything one carries on one's person.
3. Experts seem to think they (scanners) are easily defeatable, in which case metal detectors and chemical sniffers are equally capable.
4. The owners of the scanning company are involved with Homeland Security so we are basically rewarding someone for having a gigantic conflict of interest.
1. You can't trust them to not save the images and use or accidentally leak the images later, some scanners in courthouses were found to be saving images.
2. It's not reasonable to require knowledge of everything one carries on one's person.
3. Experts seem to think they (scanners) are easily defeatable, in which case metal detectors and chemical sniffers are equally capable.
4. The owners of the scanning company are involved with Homeland Security so we are basically rewarding someone for having a gigantic conflict of interest.