I understand a joke with a Volpe punch line or a joke about the NYPD's sincere efforts to increase minority recruitment (no kidding, this time they mean it) or to make the many other reforms persistently resisted by both the department and the mayor (I'm serious, this time they really, really mean it).
There are jokes circulating about the NYPD to make significant reforms.
The NYPD has made significant changes to their minority recruitment.