That's the effect of an injunction issued by a New York federal court.
The case is: Jaenean Ligon et al v City of New York, U.S. District Court, Southern District of New York, (No. 12-cv-2274).
From Amy Goodman at Democracy Now:
A federal judge has ruled that New York City police are not allowed to routinely stop pedestrians outside of private residential buildings in the Bronx. The stops are part of the so-called Clean Halls program, which has prompted allegations of police harassment by some residents who say they are being accosted outside of the buildings in which they live. Previous data on the New York Police Department’s 'stop-and-frisk' policy has shown African-American and Latino men make up a hugely disproportionate share of those stopped.