Exclusive: Inside the NYPD

The department has set out to retrain its 35,000 police officers in months.
3:33 | 03/17/15

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Transcript for Exclusive: Inside the NYPD
Inside the NYPD. The effort to retrain every single officer on the force. So much attention after Ferguson, after the Eric garner case here in New York City on police tactics. Tonight, your first look at training for takedowns. Avoiding the neck. Protecting suspects and the officers. And only our team allowed inside. Ferguson, Missouri. An unarmed black man, Michael brown, is shot to death. The officer is not indicted. Just days after that decision, we learned there would also be no indictment for a New York City police officer in the case of Eric garner. Who could be heard screaming, "I can't breathe." I can't breathe! I can't breathe! Reporter: Eight months after that decision, we are invited in. A sprawling complex. Queens, New York. Mock courtrooms, police cruisers, subway cars. Even mock atms. The NYPD not only training new recruits, but setting out to retrain every single cop, 35,000 of them, in just months. New training for takedowns to avoid another garner case. Three days of training for every officer. Lieutenant bob shepherd. One of the key focuses here is defusing the situation. Yes, de-escalating the situations. Reporter: Training right through the night. Around the clock. For folks at home, this is about 9:00 P.M. Now. Correct. Take a seat. Reporter: And inside this gym we see officers trained on new takedown methods. I'm going to come in, step slide. Bicep, at the same time. Reporter: All of the moves avoiding the chokehold. Slide down. We're behind them. Reporter: You're training all of these officers to stay away from the neck. Yes. Reporter: And how important is that? Extremely important. Reporter: When folks at home say, oh, well, I see them using the chokehold. What would you say? It is dangerous. Down on the ground. Down on the ground. Reporter: The chokehold was formally banned by the NYPD more than 20 years ago. But many argue, it is still being used in parts of this country. We try to roll him over. Why we want to promote, what? Free breathing. Free breathing. Reporter: Positional asphyxia. What does that mean? Any sort of compression on the chest. Reporter: The officers come in groups from the same present, same shift. The 2-6, west Harlem. And listen. They are candid about the last time they got this kind of training. When's the last time you practiced techniques like this? Seven years. Reporter: Seven years. 1 years. Reporter: 12 years. 14 1/2. Reporter: 14 1/2 years. It should be more. It should be done maybe twice out of the year. Reporter: How often are you taught, go nowhere near the neck? There is no neck. Reporter: How difficult is it to expect it would kick in perfectly? Someone doesn't want to be arrested, it's never looks pretty. Reporter: Because of the split-second nature of everything? Absolutely. Reporter: Officer Wattley, two son, 23 and 10. They worry about you? They do. Reporter: Do they listen to you at home? Yes, of course. Reporter: This was in the works, but there's no question that the garner case accelerated it? Yeah, certainly. In the aftermath of garner, this training accelerated. Reporter: They ared a mat that the NYPD had ordered retraining months before the garner case. Police officers after the police academy never get any physical training, tactical training after that first academy. Reporter: They walk out of the academy. That's it. Reporter: Tonight on "Nightline," the ride along. How is this new training being used on the streets?

This transcript has been automatically generated and may not be 100% accurate.

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