Not a promissing track record (Score 2, Insightful)

According to the article: "Since January 2006, behavior-detection officers have referred about 70,000 people for secondary screening, Maccario said. Of those, about 600 to 700 were arrested on a variety of charges, including possession of drugs, weapons violations and outstanding warrants." Sounds like roughly a 99% of referrals are false positives. Is the training actually worth the time, expense, and inconvenience to innocent travelers? I wonder if an observer, untrained in the subtle skill of detecting micro-facial expressions, would do much worse just by looking for people who obviously, and more generally look suspicious.