On the coldest morning New York City has seen this winter, a stream of teenage students hit a bottleneck at the front of a Brooklyn school building. They shed their jackets, gloves, and belts, shivering as they wait to pass through a metal detector and send their backpacks through an X-ray machine. School-safety agents stand nearby, poised to step in if the alarm bleats.

It’s an everyday occurrence for more than 100,000 middle and high-school students across the city.

On this morning, as on every school day, senior Justin Feldeo prepares to be pulled aside for separate screening by a hand wand. Feldeo is studying to be a firefighter and the boots he wears for class trigger the metal detectors.

Fifteen minutes after the formal start of the school day, students are still pouring in, even later for having to go through the machines.

Almost as many New York City students run the gauntlet of X-ray machines each day as pass through the scanners at busy Miami International Airport. And the procedure is numbingly similar. Students must remove belts, shoes, and sometimes bobby pins as the wait stretches as long as an hour.

ProPublica survey found that the daily ritual is borne disproportionately by students of color; black and Hispanic students in high school are nearly three times more likely to walk through a metal detector than their white counterparts.

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