But the railway authorities say monitoring and frisking five million commuters every day is impossible.
He also said there were quotas for stopping and frisking people deemed suspicious.
In frisking Mr. Ryan, politically speaking, Democrats and the media have been unable to decide where he is most vulnerable.
All the frisking, beeping, and patting down is demoralizing to our society.
The NYPD's practice of stopping, questioning and sometimes frisking hundreds of thousands of people on city streets each year has received widespread criticism.
Mr. Bloomberg didn't shy away from backing the most controversial elements of his tenure, including the NYPD's tactic of stopping people on the street that they suspect of crimes and sometimes frisking them.
This month, though, the skepticism seems to have morphed into fury and resistance, after the TSA instituted a new pat-down policy requiring those who refuse the full-body scan to undergo a fairly-aggressive frisking.
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News of the device prompted concerns from privacy advocates, though they also saw a potential benefit: It might render unnecessary the legally disputed police policy of stopping and frisking people who haven't been first identified as suspects in crimes.
North Korea's admission, when presented by America with damning evidence, that it has been enriching uranium for a second illicit nuclear-weapons programme (the first used plutonium) is a chilling reminder of why the thorough frisking of Iraq, however it comes about, will come not a moment too soon.
The bane of law-and-order fanatics, their misbehavior blasts through barriers of money and power even when those partitions cannot literally be breached: On the concrete wall built by Israeli security to blockade the Palestinian territory, Banksy has illicitly stenciled pictures of small girls frisking armed soldiers, and masked insurgents hurling bouquets of flowers.
The NYPD has said that its surveillance of Muslims is legal and that stop and frisk a technique of stopping, questioning and sometimes frisking people who are seen as acting suspiciously but who don't necessarily meet the probable-cause standard for arrest has helped drive crime down to record lows and save lives by taking weapons off the street.
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