The tax credits (although as of this morning temporarily tenuous) have really paid off:

The only thing Mayor Bloomberg’s new tough-on-crime ad is missing from “Law & Order” is that goofy noise you hear when they change scenes.

Bloomberg’s new commercial features him chatting up authentic-looking police officers whose insignia and patrol car identify them as members of the NYPD’s 27th Precinct.

The NYPD has no 27th Precinct — except on the long-running crime show.

Bloomberg spokeswoman Jill Hazelbaker says the officers in the spot are off-duty cops — although not in official uniforms — who volunteered to appear in the ad.

Government workers and property can’t be used for political purposes, she said, so the campaign rented the fake NYPD uniforms and squad car.

Similarly, Bloomberg’s new ads touting his support of public schools were actually shot in the private Xaverian High School in Bay Ridge, Brooklyn.