A federal court handed a big defeat to Mayor Michael Bloomberg and the New York Police Department today, ruling that the controversial “stop and frisk” program infringed on constitutional rights. Judge Shira Scheindlin appointed a federal monitor to oversee the NYPD and “reform” the practice, although that might prove impossible: A federal judge appointed an independent monitor Monday to oversee changes to the New York Police Department’s contentious policy known as stop, question and frisk, a significant judicial rebuke for what the mayor and police commissioner have defended as a life-saving, crime-fighting tool. …Four men had sued saying they were...