So they don't think the scan is good enough to detect real threats (which it isn't [1]). Why bother with the cancer-giving scans [2] at all then? They couldn't possibly be there just to make a few people rich [3], could they?!
[1] http://www.nbcnews.com/news/us-news/investigation-breaches-u...
[2] https://www.scientificamerican.com/article/europe-bans-x-ray...
[3] http://www.huffingtonpost.com/2010/11/23/fear_pays_chertoff_...