For now, with the metal detectors still in place, body scanners are voluntary. Agents may steer some travelers toward a scanner depending on wait times in various lines, but for the most part, you'll be able to look around and choose the lane you want to go through. If an agent does insist you join a line with a scanner, you can refuse, but you'll get a physical pat-down. Screeners might also use hand wands to check for suspect items.
TSA says its scanners don't store or save images, and emphasize that the screeners looking at the images never see passengers in-person. Some scientists say the true long term health effects of these technologies are unknown. Experts warn full body scanners at airports could increase your risk of skin cancer
I think the best way to handle the controversy of how revealing the images are, is to have separate scanners for male and females, that way the person doing the screening can be of the same gender as the person being screened
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