Updated at 2:22 p.m. ET
NEW YORK More than a hundred witnesses are expected to testify at a federal trial about the New York Police Department's practice of stopping, questioning and frisking people, reports CBS New York.
A class-action suit challenging the NYPD's stop and frisk policy got under way Monday with a lawyer saying that officers have been wrongly stopping tens of thousands of young men based solely on their race.
Darius Charney of the Center for Constitutional Rights said the policy is legal, but the department is doing stops illegally. Changes must be ordered by a federal judge to ensure the department stops wrongly targeting black and Hispanic men, he said.
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He called many of the half million annual stops a "frightening and degrading experience" for "thousands if not millions" of New Yorkers over the last decade. He called them "arbitrary, unnecessary and unconstitutional."
He promised plaintiffs will show the judge "powerful testimonial and statistical evidence" that New Yorkers are routinely stopped without suspicion.
Charney said it will include stories from a dozen black and Hispanic men who say they were targeted because of their race. Police officers and criminologists are also scheduled to testify.
Police have made about five million stops in the past decade of New Yorkers, mostly black and Hispanic men.
Legal experts say the outcome could bring major changes to the nation's largest police force.
"When we say stop, question and frisk, we're not talking about a brief inconvenience on the way to work or school," said Darius Charney of the Center for Constitutional Rights, the lead attorney on the case.
"We're talking about a frightening, humiliating experience that has happened to many folks."
The class-action lawsuit claims the NYPD's stop-and-frisk practice routinely violates the rights of minorities.
"At stake are the constitutional rights of hundreds of thousands of New Yorkers who have been illegally stopped by the NYPD and an untold number of New Yorkers who may be stopped by the NYPD in the future," Vincent Warren, director of the Center for Constitutional Rights, told 1010 WINS.
Mayor Michael Bloomberg and Police Commissioner Ray Kelly have said it is a necessary, life-saving and crime-fighting tool that helps keep illegal guns off the street and has helped New York reach all-time crime lows.
"Make no mistake, we have a responsibility to conduct them, and as long as I am mayor, we will not shirk from that responsibility," Bloomberg said in his State of the City address last month. "Is there anyone here who would sacrifice his or her life and the lives of their families and friends to end stops? I don't think so."
"The lives that have been saved has been dramatic," Kelly said. "And if somehow it's eliminated, the people who are going to suffer are the people in those areas that are most plagued by crime."
Lawyers say the trial will include stories from a dozen black and Hispanic men who say they were targeted because of their race. Police officers and criminologists are also scheduled to testify.
The lawsuit is the second and broader legal challenge to the policy to be heard in federal court recently. The suit seeks a court-appointed monitor to oversee changes to how the police make stops.
"We want an end to racially discriminatory policing, we want an end to the violation of New Yorkers' constitutional rights and we want a police department that works for the people of New York and is accountable to the people of New York," Warren said.
A federal judge will rule on whether the department must make changes.
Street stops increased substantially in the mid-1990s, when, faced with overwhelming crime, then-Mayor Rudy Giuliani made stop-and-frisk an integral part of the city's law enforcement, relying on the "broken windows" theory that targeting low-level offenses helps prevent bigger ones.
Stops rose and overall crime dropped dramatically in a city that once had the highest murder rate in the U.S.
There were only 419 murders in 2012, the lowest since similar record keeping began in the 1960s, down from more than 2,000 in the 1990s. And there were 531,159 people stopped, more than five times the number when Bloomberg took office a decade ago.
Fifty-one percent of those stopped were black, 32 percent Hispanic and 11 percent white.
According to U.S. Census figures, there are 8.2 million people in the city: 26 percent are black, 28 percent are Hispanic and 44 percent are white. About half of the people are just questioned.
Others have their bag or backpack searched. And sometimes police conduct a full pat-down. Only 10 percent of all stops result in arrest and a weapon is recovered a fraction of the time