FOR CHANGES FOLLOWING 2 DEADLY TRAFFIC STOP.

FIRST OFF TONIGHT, THE RULES THAT GOVERN WHEN CHICAGO POLICE OFFICERS CAN USE DEADLY FORCE ARE FACING NEW SCRUTINY.

THAT'S AFTER POLICE BODY CAM FOOTAGE RELEASED YESTERDAY SHOWED 4 OFFICERS FIRING 96 SHOTS DURING A TRAFFIC STOP THAT KILLED.

26 YEAR-OLD EXTRA READ REPORTER HEATHER SHARON JOINS US NOW TO BREAK IT ALL DOWN, HEATHER.

SO WE KNOW THAT THERE ARE 2 PROBES INTO THE SHOOTING DEATH OF DECKS TO READ.

LET'S TAKE THEM ONE BY ONE, STARTING WITH THE INVESTIGATION BY THE CIVILIAN OFFICE OF POLICE ACCOUNTABILITY.

WHAT WILL THAT PROBE FOCUS SO THAT PROBE WILL DETERMINE WHETHER OFFICERS FOLLOWED AND THIS IS A MOUTHFUL.

CPD DE-ESCALATION RESPONSE TO RESISTANCE AND USE OF FORCE POLICY.

THAT POLICY MAKES IT OFFICERS.

>> HIGHEST GOAL IS TO PRESERVE THE SANCTITY OF LIFE.

BUT OF COURSE THEY'RE ALLOWED TO USE AND JUSTIFIABLE FORCE WHERE THE LINE BETWEEN JUSTIFIABLE FORCE AN EXCESS OF FORCES IS REALLY WHAT THESE INVESTIGATIONS ARE GOING TO DETERMINE.

WHAT EXACTLY DO CPD RULES SAY ABOUT WHEN OFFICERS CAN USE DEADLY FORCE?

WELL, THIS POLICY LAST REWRITTEN JUST ABOUT A YEAR AGO REQUIRES OFFICERS TO USE DE-ESCALATION TECHNIQUES TO AVOID PHYSICAL CONFRONTATIONS AND THEY CAN ONLY RESPOND TO IMMINENT THREATS WITH ESCALATING USES OF FORCE BASED ON OBJECTIVELY REASONABLE NECESSARY AND PROPORTIONAL DECISIONS BASED ON THE TOTALITY OF THE CIRCUMSTANCES.

YOU'RE LOOKING AT A GRAPHIC NOW THAT SHOWS YOU JUST HOW COMPLICATED THESE DECISIONS AND THE RULES GOVERNING OFFICERS IN WHAT IS OFTEN SORT OF VERY FRAUGHT HIGH PRESSURE, HIGH STRESS SITUATION.

THAT'S WHY THESE PROTESTS ARE GOING TO SORT OF DIG INTO THE VERY NEW SHOT OF WHAT HAPPENED ON MARCH.

21ST.

YES, I'M SURE POLICE OFFICERS BUT SAY THERE'S A LOT OF CALCULATION THAT HAS TO GO GO ON IN THEIR MINDS IN IN A SITUATION LIKE THAT, HEADER.

WILL IT MATTER THAT THE INITIAL INVESTIGATION SHOWS THAT READ SHOT FIRST AND WILL IT MATTER THAT OFFICERS UNLOADED 96 SHOTS IN ABOUT 40 SECONDS?

YES, THEY WILL BOTH MATTER BECAUSE THEY WILL HAVE TO DECIDE WHETHER OFFICERS RESPONDED REASONABLY AND WHETHER THEY FACED IMMINENT THREAT.

KNOW THAT LEADS US, OF COURSE, OF THE SECOND PROBE THAT IS ALSO UNDERWAY BY COOK COUNTY STATE'S ATTORNEY KIM FOXX.

WHAT WILL HER OFFICE FOCUS ON HER OFFICE GOING TO DECIDE WHETHER IF THE SHOOTING WAS NOT JUSTIFIABLE, WHETHER THOSE OFFICERS COMMITTED CRIMINAL ACTS AND WHETHER THEY SHOULD BE CHARGED AND FACE A JURY, SHE WILL HAVE TO DECIDE WHETHER THERE IS A TO READ BEYOND A REASONABLE DOUBT.

EVIDENCE NOW COPA ONLY HAVE TO DECIDE WHETHER IT'S MORE LIKELY THAN NOT OFFICERS VIOLATED THAT CITY POLICY.

A MUCH LOWER STANDARD.

HOW LONG WILL WE HAVE TO WAIT FOR ANY ANSWERS, HEATHER?

IT'S GOING TO BE MONTHS.

THESE ARE VERY COMPLICATED FRAUGHT QUESTIONS.

THERE IS A LOT OF EVIDENCE THAT INVESTIGATORS HAVE TO SIFT THROUGH AND THEN OF