The District - Season 1 Episode 5 -

The threat of biological terrorism strikes Washington and Chief Mannion has to arrange almost all his force to search for a potential terrorist. An escapee from juvenile detention murders a taxi driver and a few drug dealers and becomes a big threat once he hides in a public schools, putting in danger hundreds of lives. Temple disguises as a student to catch the killer, in an operation that almost cost Ella the guard of her nephew, if it wasn't for Mannion's interference to the judge.