Can't wait until the fall for more Chicago P.D.? You're in luck. When the show was still in production for Season 3, TVGuide.com spent a day on the Chicago P.D. set, and here are some of the things we learned:

1. Chicago has some really crazy real-life laws ...

... and even the stars of Chicago P.D. have trouble distinguishing which ones are real and which are fake.

2.LaRoyce Hawkins andJason Beghe do a disturbingly good horse impression ...

... andJesse Lee Soffer may pretend he's someone else to avoid awkward fan encounters.

3. The Chicago P.D. cast has a pretty good working knowledge of Chicago ...

... especially Hawkins, who grew up there.

4. Sophia Bush is not to be messed with ...

... but which cast member is most likely to be on the wrong side of the handcuffs?