When the program comes with a glossary, that can be a trouble sign. The glossary for The Witness Room, Pedro Antonio Garcia’s drama-with-some-laughs, runs to three pages. So much legalese—J-D Redcap, Three and a C, Chomo—how much will an audience member be able to understand? And for the first several minutes, it’s a struggle to figure out what the heck’s going on in set designer Daniel Allen’s cluttered witness room. Stick around, though, and the narrative becomes clearer. And what follows is a compelling peek into the lives and interactions of NYPD cops, their legal maneuverings in pretrial, and how slippery their moral code can get.