The Broadway revival of “West Side Story” includes an authentically uniformed Officer Krupke thanks to the persistent research of assistant costume designer, Michael Zecker. He sought help from four different institutions before a fifth produced the only thing that satisfied his boss, costume designer David C. Woolard: the 1956 edition of “The Rules and Procedures of the NYPD.” The chief librarian at the John Jay College of Criminal Justice had a copy. Chapter 25 gave Zecker and Woolard the details they needed to put Office Krupke in a “regulation blue military shirt with 24 ligne removable brass buttons” with “black tie, tie clasp and black belt with dark buckle, preferably gun metal.” In the comments of the blog post describing the research someone signed “Crritic” says “Really? This is considered difficult research? Unbelievable.” To which someone signed “Michael Zecker” responds “To paraphrase Stephen Sondheim, ‘Hey, Crrranky Crrritic, Krup you!'”