They'll sign in at village checkpoints, sometimes stopping for mandatory layovers.

NPR: Iditarod Kicks Off With Festive Ceremonial Start

The NYPD's practice of stopping, questioning and sometimes frisking hundreds of thousands of people on city streets each year has received widespread criticism.

NPR: NAACP Head: Even Some In NYPD Oppose Street Stops

Stop-and-frisk the practice of stopping, questioning and sometimes patting down people seen as doing something questionable but not necessarily meriting arrest has become a flashpoint as the stops rose dramatically in the last decade, to nearly 700, 000 in 2011.

WSJ: Bloomberg staunchly defends NYPD policies

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.

NPR: Lawmakers Reach Deal For NYPD Inspector General

"It is sometimes said that those who are the most committed to stopping the Iranian regime from securing nuclear weapons are reckless and provocative and inviting war, " he said.

CNN: Romney talks tough but differs little from Obama on Iran

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.

WSJ: Mayor Celebrates His Achievements