>> Anchor: FIGHTING CRIME WITH TECHNOLOGY.
>> CRIMINALS GETTING SMARTER.
>> DEFENDERS TAKE YOU INSIDE OF THE DETROIT POLICE DEPARTMENT.
>> WE ARE ABLE TO IDENTIFY CRIME PATTERNS.
>> HOW DO THEY TRACK DOWN CRIMINALS.
>> VIDEO IS SILENT WITNESS.
IT DOES NOT FORGET.
>> BEHIND THE SCENE CRIME FIGHTING LESSON.
>> Anchor: TONIGHT WE ARE TAKING YOU INSIDE OF THE DETROIT POLICE DEPARTMENT SHOWING YOU SOME NEW WAYS THEY FIGHT CRIME.
>> Anchor: TECHNOLOGY, CAMERAS AND INSTANT INFORMATION ESSENTIAL FOR OFFICER WHEN IS SEARCHING FOR BAD GUYS.
BUT HOW?
>> KAREN: RECEIVED UNPRECEDENTED ACCESS AND HAS THIS SPECIAL REPORT.
>> Reporter: WE KNOW GOOD OLD FASHION POLICE WORK KNOCKING ON DOORS.
TALKING TO SOURCES IN PART IS HOW THEY SOLVE CRIMES.
BUT MORE AND MORE INSIDE OF THE DETROIT POLICE HEADQUARTERS THEY RELY ON TECHNOLOGY.
YOU'RE INSIDE OF THE REAL-TIME CRIME CENTER.
FILLED WITH VIDEO FEEDS FROM CAMERAS ALL OVER THE CITY.
SOME OF THE OPEN, OTHERS IN SECRET LOCATIONS.
AND LOOKING TO CATCH CRIMINALS IN THE ACT.
>> THEORY ON VIDEO IS SILENT WITNESS IT DOES NOT FORGET OR CHANGE ITS MIND OR GET INTIMIDATED.
>> Reporter: SERGEANT SULLIVAN IN HOMICIDE SQUAD TRACKING DOWN KILLERS FOR LAST 13 YEARS.
BUT THE WAY HE TRACKS THEM DOWN SURE HAS CHANGED.
>> CAMERAS ARE EVERY DAY PART OF LIVES.
YOU KNOW THEY ARE EVERYWHERE.
YOU KNOW A MATTER OF FINDING THEM AND FINDING THE TIME LINE THOSE CAMERAS FIT IN WHEN CRIME FITS.
>> IT WAS CAMERA FOOTAGE IN 2014 THAT RECORDED THIS MAN GOING IN AND OUT OF THE TIRE STORE ON LIVERNOID.
THAT HELPED TO SOLVE A ROBBERY MURDER THERE.
>> WE GET TO THE SCENE.
AND THERE IS NOTHING THERE.
WE HAVE A DECEASED PERSON.
>> Reporter: BRING IN MORE TECHNOLOGY.
>> THERE WAS 1 GP.
IS IT TETHER IN THE AREA.
>> Reporter: TRAN TRACK DOWN THE SUSPECT.
>> CONFESSED.
CHARGED WITH ARMED ROBBERY, AND FIRST-DEGREE MURDER AND PLED GUILTY TO A NUMBER OF YEARS VERSUS LIFE.
>> Reporter: SERGEANT SULLIVAN SPENDS HOURS SCOURING SURVEILLANCE VIDEOS.
SOME FROM CAMERAS AT BUSINESSES AND OTHERS FROM HOMEOWNERS.
>> DOOR BELL CAMERAS, PEOPLE PROTECTING THEIR PROPERTY.
>> Reporter: ALL PIECES OF A PUZZLE IN SOLVING CRIMES.
>> DIGITAL ALLOWS LONGER STORAGE.
AND I ALLOWS HIGHER DEFINITION.
>> Reporter: THEY ARE CATCHING MORE CRIMINALS THE ACT.
LIKE ILLEGAL DUMPERS.
>> PLACE THEM UNDER ARREST AND CONFISCATE VEHICLES.
>> Reporter: ASSISTANT CHIEF WHITE SUPPORTS OPERATIONS.
>> WE ARE LEVERAGING TECHNOLOGY.
>> Reporter: HOT SPOT MAPS OF CRIME THROUGHOUT THE CITY UPDATE SOD PATROLS KNOW EXACTLY WHERE TO FOCUS THEIR ATTENTION EACH DAY.
>> WHAT CRIME TRENDS ARE HAPPENING.
HOW MANY 911 CALLS WE HAVE HAD AT A PARTICULAR AREA AND MAKE THE POINT OF DECISION BASED ON THAT INFORMATION.
>> Reporter: WHEN AN OFFICER IS SENT TO THE CALL TECHNOLOGY IN THE CAR PREPARES HIM FOR WHAT TO EXPECT.
>> YOU KNOW WE ARE ABLE TO PUSH VIDEO DATE FAT.
THERE IS ANY.
AND ABLE TO PUSH WITH PICTURES.
>> Reporter: OFFICER ARRIVES ON SCENE AND GETS UP -- UPDATED INFORMATION ON THAT ADDRESS.
>> IF THERE WERE A PERSON IN THE HOME KNOWN TO BE VIOLENT.
A PERSON THAT SUFFERING FROM MENTAL INCAPACITATION KNOWN TO BE VIOLENT OR A AGGRESSIVE TOWARD OFFICER.
A HISTORY OF WEAPONS IN THE HOME.
THOSE THINGS.
>> IT MEANS INCREASED OFFICER ASAFETY.
SO THEY UNDERSTAND WHAT THEY ARE DEALING WITH BEFORE GETTING THERE.
AND MEANS INCREASED CITIZEN SAFETY AS WELL.
>> GREEN LIGHT LOCATION ALERT.
>> Reporter: ALL OF THAT TECHNOLOGY THEN ADD THE 235 BUSINESSES IN DETROIT PARTICIPATING IN THE GREEN LIGHT PROJECT.
AND CAMERAS ARE POSTED IN AND OUT OF BUSINESSES WITH DIRECT FEEDS TO POLICE HEADQUARTERS.
POLICE HIGH TECH CRIME FIGHTING IS WORKING.
>> WE HAD TO GET SMARTER.
>> KAREN: DEFENDERS.
>> 235 NOW DIRECT FEEDS.
AND PROGRAM