Many officers faced only “informal discipline” for a practice that a federal court said was unconstitutional in 2013.

The New York City police department is lax in punishing officers who illegally stop and frisk people on the street, undermining efforts to curb wrongful use of tactic than a judge declared unconstitutional more than a decade ago.

The report was prepared by James Yates, a retired state judge asked to take a hard look at stop-and-frisk policies by Federal Judge Analisa Torres