An inside look at the system that cut crime in New York by 75 percent

Candidates Weigh in on Crime Bill

The crime fighting innovation that helped make New York into America's safest big city requires police officers to question not just suspects, but each other.

On a recent weekday morning, Inspector Carlos Valdez stood nervously behind a podium as more than 200 top NYPD cops grilled him about a surge in robberies and burglaries in the 40th Precinct in the Bronx.

"Alright, Carlos, you know why you're up there," Chief James O'Neill said. "A lot of things going on in the Four-o. Crime is definitely not headed in the right direction."

Click through images of New York City's top sights and landmarks:

New York City sights, landmarks
See Gallery
An inside look at the system that cut crime in New York by 75 percent
New York City downtown and Brooklyn bridge
new york city august 07 the ...
The Empire State Building in New York City, Manhattan.
New York City, Manhattan, New York, United States, North America
New York City, New York, United States, North America
statue at rockefeller centre, fifth avenue, new york, usa
ABC NEWS - 9/24/15 - Coverage of Pope Francis' visit to New York City to celebrate Mass at St. Patrick's Cathedral which will air on all ABC News programs and platforms. (Photo by Ida Mae Astute/ABC via Getty Images)
Ice skaters having fun in New York Central Park in fall
View of the midtown Manhattan skyline and Central Park in New York City.

Watch Weekend Nightly News at 6:30 ET tonight for an exclusive look inside Compstat

Valdez defended his work, and that of the detectives from the 40th Precinct, who're standing behind him.

"We're up in robberies, assaults, burglaries and grand larcenies, but we're also up in arrests for those index crimes," said Valdez, his voice cracking.

The brass didn't let up, on Valdez or a troop of other precinct commanders who appear at the podium to parry questions about crime on their turf.

"We need it fixed yesterday," snapped Deputy Commissioner Dermot Shea.

Compstat, a statistical system for tracking crime, was introduced by Police Commissioner Bill Bratton and his deputy, Jack Maple, in 1994, during Bratton's first stint as head of the NYPD. Twenty-two years later, Bratton is once again the top cop in Gotham, Compstat is still in use, and crime has fallen 75 percent — a fact Bratton calls a "New York miracle." The city had 1,946 murders in 1993, or more than a five a day. It had 352 in 2015.

The system is based on tracking and stopping smaller crimes to stop bigger crimes, and to pinpoint hotspots where crimes are clustered. It has since been exported to other cities, like Philadelphia and Los Angeles, where Bratton also served as chief of police.

The NYPD recently allowed NBC News unprecedented access to one of its weekly Compstat meetings at One Police Plaza in downtown Manhattan. Television monitors displaying stats, graphs and maps lined the walls, above long tables filled with about 200 high-ranking officers.

At one end of the room were the bosses, lobbing the questions, and at the other end was a podium, where precinct commanders like Valdez took turns trying to answer them.

Valdez was assigned to the 40th Precinct several months ago to address a spike in crime. Valdez deployed extra officers to streets with jumps in robberies. He also met with detectives about unsolved cases big and small — from murders to burglary patterns.

"Analyzing data, deploying resources and vigorous follow-up, that is Compstat," Valdez said. "In the end, crime prevention is really the goal."

While NBC News was visiting and recording his team at work in the Bronx, someone shot a young man to death nearby — right next to a playground, in the middle of the afternoon.

More from NBC News:
Ted Cruz Dominates Again in Colorado Delegate Push
Suit Challenging Cruz Eligibility Reaches Supreme Court
Ted Cruz On McConnell Accusation: 'Every Word I Said Is True'

Read Full Story