/ A 20/20 vest gagsz breaking right here first. Police enforce the speed limit, but is there a double standard? Tonight the choppers overhead, our correspondent trying to keep up with them. And where... See More
/ A 20/20 vest gagsz breaking right here first. Police enforce the speed limit, but is there a double standard? Tonight the choppers overhead, our correspondent trying to keep up with them. And where were those officers headed? Here's abc's matt gutman. on the road. Cops speeding for no good reason. And sometimes killing. So we decided to turn the tables. Set our trap. We deploy four surveillance teams. Three, two, one. Mark. Reporter: Clocking at different check points where the speed limit is 65. And a chopper tracking from the sky, so we don't break the law by speeding ourselves. It's not long until this cruiser flies by our check points. Going about 85. It's hard for us to catch up. Reporter: No lights. Nosey renes. The offer's destination hardly an emergency just dropping off evidence at the state crime lab. I don't have a comment. You don't have a comment? No. Reporter: Speeding cops get coming. This officer cruising by at 79 miles per hour. Our chopper follows him to you won't believe this, a doughnut shop. And take a look at this highway patrol suv. So this guy is going well over 80. His destination a highway patrol training academy. Where the speed demon is, yes, a driving instructor. A lot of folks want to see you set an example, and going about 15, 20 miles over the speed limit, there might be some concern. I don't understand what you're saying. Matt confronts these officers some closing the door in your face. You go to their superior. They open the door, allow us to talk to them. We're going to have more on 20/20 tonight. We get the tickets, they don't. Matt, we'll see you on 20/20. Much on this special out of bounds tonight at 10:00, 9:00 central.
This transcript has been automatically generated and may not be 100% accurate.