>>> TONIGHT, THE TERRIFYING IMAGES JUST RELEASED OF THE LOUISVILLE MASS SHOOTING POLICE BODY CAMERA VIDEO SHOWING HOW OFFICERS CONFRONTED THE GUNMAN, WHO POLICE SAY AMBUSHED THEM AFTER SHOOTING AND KILLING FIVE OF HIS FELLOW BANK WORKERS USING AN AR-15 HE BOUGHT LEGALLY. ONE OFFICER SHOT AT, AND THEN GETTING BACK UP TO RE-ENGAGE. OFFICERS BEING HAILED AS HEROES FOR STOPPING HIM FROM KILLING MORE PEOPLE. WERE THERE WARNING SIGNS, AND WHAT HIS NEIGHBORS ARE SAYING >>> DAMAGE CONTROL NEW REVELATIONS FROM THE LEAKED CLASSIFIED INTELLIGENCE DOCUMENTS, PUTTING U.S. ALLIANCES IN QUESTION. THE MANHATTAN DISTRICT ATTORNEY SUES A TOP HOUSE REPUBLICAN, CLAIMING INTERFERENCE IN THE INVESTIGATION OF DONALD TRUMP >>> THE BATTLE OVER AN ABORTION PILL BIG PHARMA PUSHING BACK AGAINST A RULING, AS SOME STATES START STOCKPILING DRUGS. >>> TOUGH NEW AUTO EMISSION STANDARDS ABOUT TO BE ANNOUNCED, BUT WILL THEY PUSH MORE AMERICANS TO GO ELECTRIC >>> A BIG UPSIDE OF ARTIFICIAL INTELLIGENCE, DETECTING CANCER MUCH EARLIER, AND PREDICTING WHEN IT MIGHT STRIKE >>> AND THE YOUNG BOLD ATHLETES SHARING THEIR CULTURE AND MOVES WITH SKATEBOARDING SUPERSTAR TONY HAWK. >> Announcer: THIS IS "NBC NIGHTLY NEWS" WITH LESTER HOLT. >>> GOOD EVENING, AND WELCOME. ONCE AGAIN, IN THE TRAGIC AFTERMATH OF A MASS SHOOTING, WE'RE GETTING A HEART-STOPPING FIRST PERSON LOOK AT POLICE RISKING THEIR OWN LIVES TO STOP AN ACTIVE SHOOTER. LATE THIS AFTERNOON, LOUISVILLE POLICE RELEASING BODY CAM VIDEO OF OFFICERS RUSHING TO A DOWNTOWN BANK YESTERDAY, IMMEDIATELY COMING UNDER FIRE FROM A BANK EMPLOYEE HE WAS ARMED WITH AN AR-15 ASSAULT-STYLE RIFLE, CARRYING OUT A MURDEROUS RAMPAGE, FATALLY SHOOTING FIVE PEOPLE THE GUNMAN KILLED BY POLICE TONIGHT ONE OF THOSE OFFICERS WHO RUSHED TO STOP A GUNMAN, A ROOKIE, JUST DAYS ON THE STREETS REMAINS IN CRITICAL CONDITION, AND TONIGHT THERE IS A DEEPER UNDERSTANDING OF JUST HOW CLOSE TO HOME THESE SHOOTINGS ARE FOR MANY AMERICANS A NEW SURVEY OUT TONIGHT FINDING ONE IN FIVE U.S. ADULTS SAY THEY HAVE BEEN THREATENED WITH A GUN MAGGIE VESPA LEADS US OFF TONIGHT WITH NEW DETAILS. >> Reporter: ECHOES OF GUNFIRE AS OFFICERS SPEED UP TO THE SCENE. TONIGHT, A FIRSTHAND LOOK AT POLICE SAY SEVEN MINUTES OF HORROR PLAYING OUT INSIDE A KENTUCKY BANK. POLICE BODY CAMERA AND CELL PHONE VIDEO SHOWING LOUISVILLE METRO OFFICERS' VIEW MONDAY MORNING AS THEY RACE TO CONFRONT A LONE GUNMAN, ONE TAKING GUNFIRE AS WINDOWS SHATTER, FALLING, THEN JUMPING RIGHT BACK UP MINUTES LATER KILLING THE SHOOTER. >> I THINK HE IS DOWN! >> Reporter: WHAT WAS IT LIKE TO WATCH THAT BODY CAMERA VIDEO? >> IT REALLY SHAKES THE CORE IT SHAKES THE CORE TO KNOW THAT LIFE WAS BEING LOST. >> Reporter: INVESTIGATORS SAY CONNOR STURGEON, SEEN HERE ON SURVEILLANCE CAMERAS, WAS ARMED WITH AN AR-15 RIFLE, WHICH HE BOUGHT LEGALLY FROM A LOCAL DEALERSHIP SIX DAYS BEFORE THE MASSACRE, ADDING THE 25-YEAR-OLD WAS A CURRENT EMPLOYEE AT OLD NATIONAL BANK AND KNEW THE COLLEAGUES HE TARGETED OVERNIGHT OFFICIALS CONFIRMING A FIFTH VICTIM DIED, 57-YEAR-OLD DEANA ECKERT MEANWHILE, DISPATCH AUDIO INDICATING THE SHOOTER MAY HAVE TRIED TO WARN A FRIEND BEFORE THE ATTACK >> ON THE SHOOTER, 25-YEAR-OLD WHITE MALE CONNOR STURGEON, 6'4" HE TEXTED A FRIEND, CALLED A FRIEND, LEFT A VOICE MAIL, SAID HE IS GOING TO KILL EVERYONE AT THE BANK HE IS FEELING SUICIDAL. >> WE KNOW HE LEFT A NOTE WE KNOW HE TEXTED OR CALLED ONE PERSON AT LEAST TO LET THEM KNOW HE WAS SUICIDAL OR CONTEMPLATING HARM >> Reporter: NEIGHBORS OF STURGEON'S HOME SHOCKED BY THE NEWS. >> CAN'T SAY NOTHING REALLY BAD ABOUT THE GUY. VERY QUIET, SOFT-SPOKEN, HI, BYE. I JUST DON'T UNDERSTAND >> Reporter: DOCTORS ALSO STRUGGLING >> THERE IS ONLY SO MANY TIMES YOU CAN WALK INTO A ROOM AND TELL SOMEONE THEY'RE NOT COMING HOME TOMORROW, AND IT JUST BREAKS YOUR HEART. WHEN YOU HEAR SOMEONE SCREAMING "MOMMY" OR "DADDY," IT JUST BECOMES TOO HARD. >> Reporter: TONIGHT THREE REMAIN HOSPITALIZED, INCLUDING OFFICER NICKOLAS WILT IN CRITICAL WITHIN THE CHIEF ADDING WILT WAS ON HIS FOURTH SHIFT, LESS THAN TWO WEEKS OUT OF THE ACADEMY. HIS TWIN BROTHER JUST STARTED. ALSO WOUNDED OFFICER OFFICER CORY GALLOWAY WHO INVESTIGATORS SAY KILLED THE SHOOTER >> I CAN'T HEAR HER VOICE ANYMORE. I CAN'T TOUCH HER. I CAN'T TELL HER HOW MUCH I LOVE HER. >> Reporter: THE DETAILS DO NOTHING TO NUMB HER PAIN HER 45-YEAR-OLD DAUGHTER, JULIANA FARMER, AMONG THE DEAD, AMID A SUCCESSFUL CAREER IN BANKING, SHE WAS JUST RECRUITED BACK TO LOUISVILLE AND OLD NATIONAL BANK THREE WEEKS AGO. HOW DO YOU MAKE SENSE OF THAT? SHE JUST GOT BACK THERE. >> THERE IS NO SENSE TO BE HAD. I JUST FEEL LIKE THAT MAN STOLE HER FROM US. I DON'T UNDERSTAND HIS REASONING. I DON'T UNDERSTAND WHY SHE'S GONE >> AND, MAGGIE, OFFICIALS, I KNOW, ARE PLOTTING THE HEROISM DISPLAYED BY POLICE EVEN AFTER THE SHOOTER WAS DOWN >> YEAH, LESTER, THAT'S RIGHT THEY TELL US HERE YESTERDAY EMS AGENCIES WERE ACTUALLY SHORT-STAFFED. SO A LOUISVILLE POLICE LIEUTENANT IMPROVISED JUMPING IN THE FRONT SEAT OF AN AMBULANCE AND DRIVING IT TO THE HOSPITAL, ALLOWING EMS WORKERS IN THE BACK TO KEEP CARING FOR A WOUNDED PATIENT. LESTER >> MAGGIE VESPA IN LOUISVILLE, THANK YOU. >>> AND THERE WAS YET ANOTHER DEADLY MASS SHOOTING TODAY, THIS ONE IN WASHINGTON, D.C., AS A NEW SURVEY SHOWS JUST HOW MUCH AMERICANS ARE AFFECTED BY GUN VIOLENCE HERE IS GABE GUTIERREZ. >> Reporter: AS A FUNERAL FOR A SHOOTING VICTIM WRAPPED UP IN D.C. TODAY, GUNFIRE ERUPTED AGAIN. ONE MAN KILLED, THREE OTHERS HURT FROM WORKPLACE VIOLENCE TO SCHOOL SHOOTINGS, ACCORDING TO A NEW SURVEY FROM TH KAISER FAMILY FOUNDATION, A MAJORITY OF U.S. ADULTS HAVE EITHER PERSONALLY OR HAD A FAMILY MEMBER WHO HAS BEEN IMPACTED BY A GUN-RELATED INCIDENT, INCLUDING SUICIDE. NEARLY ONE IN FIVE AMERICANS HAVE LOST A FAMILY MEMBER TO GUN VIOLENCE, WITH PEOPLE OF COLOR DISPROPORTIONATELY IMPACTED SO IS THIS ABOUT MENTAL HEALTH, OR IS IT ABOUT EASY ACCESS TO GUNS >> IT'S ABOUT BOTH OF THEM. >> Reporter: JACKIE ROWE-ADAMS LOST TWO SONS, ANTHONY AND TYRONE, TO GUN VIOLENCE SHE NOW RUNS A SUPPORT GROUP IN HARLEM >> WHEN I HEAR ABOUT THIS CONSTANT SHOOTING, IT PAINS ME I HURT SO BAD, BECAUSE I KNOW ANOTHER FAMILY, ANOTHER MOTHER, FATHER, FAMILY IS HURTING FOR THE LOSS OF THEIR LOVED ONE. >> Reporter: AS THE NATIONWIDE DEBATE OVER ACCESS TO GUNS HEATS UP, A DAY AFTER THE MASS SHOOTING IN LOUISVILLE, THE CITY'S MAYOR FUMED OVER A STATE LAW THAT REQUIRES CONFISCATED FIREARMS LIKE THE RIFLE THE KILLER USED ON MONDAY TO BE RESOLD AT AUCTION. >> IT'S TIME TO CHANGE THIS LAW AND LET US DESTROY ILLEGAL GUNS AND DESTROY THE GUNS THAT HAVE BEEN USED TO KILL OUR FRIENDS AND KILL OUR NEIGHBORS. >> Reporter: WHILE IN TENNESSEE, REPUBLICAN GOVERNOR BILL LEE TODAY CALLED FOR STRONGER BACKGROUND CHECKS FOR GUN PURCHASES. >> THE EXECUTIVE ORDER WILL, FOR ONE THING, SET A 72-HOUR CLOCK FOR REPORTING NEW CRIMINAL ACTIVITY >> Reporter: OTHER STATES LIKE MARYLAND, WASHINGTON, AND COLORADO ARE MOVING FORWARD WITH NEW RESTRICTIONS AS GUN RIGHTS ADVOCATES PUSH BACK ON WHAT THEY CONSIDER UNCONSTITUTIONAL OVERREACH. >> NO AMOUNT OF GUN CONTROL IS GOING TO STOP A CRIMINAL HELL-BENT ON MURDER FROM GAINING SOME TOOLS TO DO IT. >> Reporter: THE KAISER SURVEY ALSO SHOWED THAT ABOUT A THIRD OF ADULTS HAVE AVOIDED LARGE CROWDS DUE TO THE POSSIBILITY OF GUN VIOLENCE LESTER >> ALL RIGHT, GABE, THANK YOU. >>> TONIGHT U.S. OFFICIALS ARE SCRAMBLING TO CONTROL THE DAMAGE FROM THE DISCLOSURE OF INTELLIGENCE SECRETS AFTER DOZENS OF CLASSIFIED DOCUMENTS WERE LEAKED ONLINE ANDREA MITCHELL NOW WITH THE LATEST >> Reporter: TONIGHT, THOSE LEAKED DOCUMENTS CAUSING TOUGH CONVERSATIONS BETWEEN WASHINGTON AND U.S. ALLIES. ON UKRAINE, A U.S. INTELLIGENCE ASSESSMENT THAT UKRAINE'S MILITARY WILL FALL WELL SHORT OF RETAKING MOST OF THE TERRITORY IT'S LOST TO RUSSIA ACCORDING TO A DOCUMENT OBTAINED BY "THE WASHINGTON POST" AND A DOCUMENT SEEN BY NBC NEWS REVEALING UKRAINIAN AGENTS LAUNCHED DRONE ATTACKS AGAINST TARGETS IN RUSSIA AND ITS ALLY BELARUS, INCLUDING JUST OUTSIDE MOSCOW, DESPITE PROMISING THE U.S. IT WOULD NOT STRIKE RUSSIA. SECRETARY OF STATE BLINKEN SPOKE WITH UKRAINE'S FOREIGN MINISTER TODAY. ARE YOU CONCERNED ABOUT CROSS-BORDER ATTACKS >> UKRAINE HAS TO MAKE DECISIONS ABOUT HOW IT CAN MOST EFFECTIVELY DEFEND ITSELF AGAINST RUSSIAN AGGRESSION. >> Reporter: ANOTHER LEAKED DOCUMENT SAYS EGYPT'S PRESIDENT AL SISI RECENTLY ORDERED 40,000 ROCKETS TO BE PRODUCED FOR RUSSIA, ACCORDING TO "THE WASHINGTON POST. EGYPT DENIES IT. SINCE CAMP DAVID IN 1978, EGYPT HAS RECEIVED MORE THAN 50 BILLION IN MILITARY AID AND $30 BILLION IN ECONOMIC AID FROM THE U.S., MORE THAN ANY OTHER COUNTRY IN THE MIDDLE EAST EXCEPT ISRAEL. HOW COULD INTELLIGENCE OFFICIALS NOT KNOW SOONER ABOUT THE LEAKS? SIR, WHY DIDN'T YOU KNOW ABOUT IT BEFORE APRIL 6th? THAT MEANS THEY WERE UP FOR AT LEAST AS MANY WEEKS, IF NOT MONTHS, BEFORE U.S. INTELLIGENCE KNEW THAT THEY WERE IN THE PUBLIC DOMAIN. >> THEY WERE SOMEWHERE IN THE WEB, AND WHERE EXACTLY AND WHO HAD ACCESS AT THAT POINT, WE DON'T KNOW. >> Reporter: THE PENTAGON IS NOW IN DAMAGE CONTROL, LIMITING THE NUMBER OF PEOPLE WHO CAN SEE SUCH HIGHLY CLASSIFIED DOCUMENTS. LESTER >> ANDREA MITCHELL, THANK YOU. >>> IN NEW YORK, THE MANHATTAN D.A. PROSECUTING FORMER PRESIDENT TRUMP IS SUING THE HOUSE JUDICIARY CHAIRMAN JIM JORDAN GARRETT HAAKE JOINS ME NOW FROM CAPITOL HILL GARRETT, EXPLAIN WHAT THIS MEANS? >> WELL, LESTER, MANHATTAN D.A. ALVIN BRAGG HAS ASKED A FEDERAL JUDGE TO BLOCK A HOUSE JUDICIARY COMMITTEE SUBPOENA FOR A FORMER TOP PROSECUTOR IN HIS OFFICE WHO IS BEING ORDERED TO TESTIFY NEXT WEEK NOW BRAGG ALSO ASKED THE JUDGE TO VOID ANY SUBPOENA S THAT MIGHT BE FILED AGAINST HIM OR HIS CURRENT STAFF THE DEMOCRATIC D.A. ARGUES THAT CONGRESS HAS NO POWER TO SUPERVISE STATE CRIMINAL PROSECUTIONS, AND THAT EFFORTS BY REPUBLICAN COMMITTEE CHAIRMAN JIM JORDAN TO FORCE TESTIMONY OR ACQUIRE DOCUMENTS RELATED TO HIS PROSECUTION OF DONALD TRUMP ARE PURELY POLITICAL WITH NO LEGISLATIVE PURPOSE. JORDAN RESPONDING TONIGHT IN PART IN A TWEET THAT READS "FIRST THEY INDICT A PRESIDENT FOR NO CRIME, THEN THEY SUE TO BLOCK CONGRESSIONAL OVERSIGHT. LESTER, BACK TO YOU. >> GARRETT HAAKE, THANK YOU. >>> MAJOR BACKLASH FROM THE DRUG INDUSTRY TO THAT ABORTION PILL RULING NOW SOME STATES ARE STOCKPILING ABORTION DRUGS AS THE LEGAL BATTLE PLAYS OUT LAURA JARRETT HAS THE LATEST >> Reporter: A SHOW OF FORCE FROM BIG PHARMA, NOW WADING INTO THE BATTLE OVER A WIDELY USED ABORTION PILL. MORE THAN 600 DRUGMAKERS AND BIOTECH LEADERS SIGNING ON TO A SCATHING CONDEMNATION OF THAT RULING B THAT FEDERAL JUDGE IN TEXAS INVALIDATING THE FDA'S LONG TIME APPROVAL OF MIFEPRISTONE, ACCUSING THE JUDGE OF ACTIVISM >> NOW IT'S NOW BEEN SHOWN THAT COURTS CAN STEP IN AND OVERTURN A SCIENTIFIC DECISION. >> Reporter: DR. AMANDA BANKS, FORMER CEO OF BLACKFYNN THERAPEUTICS, WHO CO-AUTHORED THE LETTER SAYS THE JUDGE'S RULING SETS A DANGEROUS PRECEDENT THAT EXTENDS BEYOND THE ABORTION ISSUE >> IF ONE MEDICINE IS SUBJECT TO THIS KIND OF OUTCOME, REALLY ANY MEDICINE IS. >> Reporter: PRESIDENT BIDEN ALSO SLAMMING THE DECISION TODAY. >> MY THOUGHTS ARE IT'S COMPLETELY OUT OF BOUNDS WHAT THE JUDGE DID. >> Reporter: WHILE THE ANTI-ABORTION GROUP THAT FILED THE TEXAS LAWSUIT IS DOUBLING DOWN, WRITING IN A STATEMENT, QUOTE, THE FDA FAILED TO ABIDE BY ITS LEGAL OBLIGATIONS TO PROTECT THE HEALTH, SAFETY, AND WELFARE OF GIRLS AND WOMEN. WITH THE TEXAS ORDER SET TO GO INTO EFFECT EARLY SATURDAY UNLESS BLOCKED IN THE COURTS, DEMOCRATIC GOVERNORS ARE NOT WASTING ANY TIME TAKING MATTERS INTO THEIR OWN HANDS >> WE'RE TAKING A CLOSE LOOK AT ALL OF OUR OPTIONS >> Reporter: MASSACHUSETTS, WASHINGTON STATE, NEW YORK, AND CALIFORNIA ALL NOW STOCKPILING YEARS' WORTH OF MIFEPRISTONE, OR AN ALTERNATIVE ABORTION PILL. >> SO I'M PROUD TO ANNOUNCE THAT NEW YORK STATE WILL CREATE A STOCKPILE OF MISOPROSTOL, ANOTHER FORM OF MEDICATION ABORTION >> Reporter: IT'S ALL IN PREPARATION FOR A DECISION THAT WOULD APPLY NATIONWIDE >> SO, LAURA, WHERE DOES ALL THIS STAND RIGHT NOW AS FAR AS THE COURTS ARE CONCERNED? >> SO LATE TONIGHT AND TOMORROW, WE SHOULD SEE MORE COURT FILINGS FROM BOTH THE PLAN THAT FILED THE TEXAS LAWSUIT AND THE JUSTICE DEPARTMENT, WHICH IS ASKING THE 5th CIRCUIT COURT OF APPEALS TO FREEZE THAT JUNG'S ORDER ONCE ALL THE APPEALS ARE IN MIDDAY TOMORROW, WE COULD SEE A DECISION FROM THAT COURT ANY TIME >> LAURA JARRETT, THANKS VERY MUCH >>> IN 60 SECONDS, THE TOUGH NEW AUTO EMISSION STANDARDS ABOUT TO BE ANNOUNCED WILL THEY PUSH MORE AMERICANS TOWARD ELECTRIC VEHICLES >>> PLUS, SPRING IS HERE AND ALRE >>> SPRING IS HERE, BUT MUCH OF THE COUNTRY IS SEEING RECORD HIGHS RECORD TEMPERATURES IN PLACES LIKE PHOENIX AND LAS VEGAS, EVEN SOUTH DAKOTA HIT THE 90s. DENVER BROKE ITS RECORD, AND TEMPERATURES ARE EXPECTED TO CLIMB THIS WEEK, BRINGING RECORD HIGHS TO THE NORTHEAST. TO ROLL OUT STRICT NEW EMISSION STANDARDS THAT WILL REQUIRE AUTOMAKERS TO ACCELERATE THE TRANSITION FROM GAS TO ELECTRIC BUT ARE CARMAKERS AND DRIVERS READY? HERE IS TOM COSTELLO >> Reporter: THEY'RE AMONG AMERICA'S FASTEST SELLING CARS AVERAGE PRICE, AN EYE-POPPING $58,000. ELECTRIC VEHICLES, EVs, MAKE UP 7% OF NEW CAR SALES. NOW THE BIDEN ADMINISTRATION WANTS TO ACCELERATE THE GREEN REVOLUTION WITH TOUGHER EMISSION STANDARDS, AND INDUSTRY SOURCES SAY REQUIRING THAT EVs MAKE UP AT LEAST 54% OF AUTOMAKERS' NEW CAR SALES BY 2030, TWO-THIRDS OF SALES BY 2032. >> RUNNING ON A CLEANER GRID, MAKING AND INVENTING THE TECHNOLOGY IS GOING TO POWER THE FUTURE. >> Reporter: AUTOMAKERS ARE ALREADY INVESTING BILLIONS T TRANSITION FROM GAS TO ELECTRIC GENERAL MOTORS' CEO MARY BARRA -- >> THE QUICKER WE CAN BRING EVERYONE ALONG TO EVs, THE BETTER IT'S GOING TO BE FOR CLIMATE. >> Reporter: WE'VE SEEN THE GREEN REVOLUTION FIRSTHAND, FROM THE ASSEMBLY LINE, 3,000 POUNDS OF LITHIUM-ION CELLS HELPING THE HUMMER TO ACCELERATE FROM 0 TO 60 IN 3 SECONDS -- TO THE FRONT LINE EVENTUALLY, THEY WANT TO TAKE THEIR WHOLE FLEET ELECTRIC JUST TWO YEARS AGO AUTOMAKERS AGREED THAT EVs WOULD MAKE UP HALF THEIR SALES BY 2030 NOW THE INDUSTRY SAYS THE NEW WHITE HOUSE GOALS AREN'T REALISTIC, WRITING IN A STATEMENT, THIS REQUIRES A MASSIVE 100-YEAR CHANGE TO THE U.S. INDUSTRIAL BASE AND THE WAY AMERICANS DRIVE. >> AND THERE ARE A LOT OF THINGS THAT HAVE TO HAPPEN TO GET US TO A FULL EV CULTURE. >> Reporter: INCLUDING RAW MATERIALS, CHARGING STATIONS, AND THE ELECTRIC GRID TO POWER IT FOR NOW, STICKER SHOCK MAY CONVINCE MANY AMERICANS TO STICK WITH THEIR GAS GUZZLERS TOM COSTELLO, NBC NEWS, WASHINGTON >>> UP NEXT, WE'LL TAKE A LOOK AT HOW ARTIFICIAL INTELLIGENCE IS ALREADY MAKING A DIFFERENCE IN DETECTING CAN >>> BACK NOW WITH OUR SERIES, "AI REVOLUTION," AND THE AMAZING ADVANCES BEING MADE IN ARTIFICIAL INTELLIGENCE TECHNOLOGY TONIGHT DR. JOHN TORRES SHOWS US HOW AI IS A GROWING WEAPON IN THE BATTLE AGAINST CANCER >> Reporter: DON ROBERTS IS LUCKY TO BE ALIVE. >> NO ONE EVER THINKS THEY'RE AT RISK FOR DEVELOPING LUNG CANCER. >> Reporter: DURING A TREATMENT FOR A KIDNEY STONE, DOCTORS FOUND A MASS IN HIS LUNG AND WERE ABLE TO OPERATE BEFORE THE CANCER SPREAD. >> THEY WOULD NEVER HAVE FOUND IT, AND IN ALL LIKELIHOOD, I WOULD NOT BE HERE TALKING WITH YOU TODAY. >> BREATHE IN. >> Reporter: THE CDC RECOMMENDS PEOPLE AT HIGH RISK FOR THE DISEASE GET SCREENED WITH A LOW DOSE CT SCAN BUT EVEN WITH REGULAR SCREENING, THE MOST SKILLED RADIOLOGIST CAN'T SPOT EVERYTHING. >> THIS LOOKS NORMAL TO YOU YOU DON'T SEE A CANCER HERE >> HOW OFTEN ARE WE MISSING LUNG CANCER DIAGNOSES RIGHT NOW? >> WELL, MOST PEOPLE WHO GET DIAGNOSED WITH LUNG CANCER UNFORTUNATELY PRESENT WITH STAGE 4 METASTATIC DISEASE BECAUSE IT HAS SPREAD SOMEPLACE THAT IS CAUSING THEM A PAIN OR A SYMPTOM, AND THEN THEY GOOD TO THEIR DOCTOR SO WE'RE MISSING MOST CASES OF EARLY STAGE LUNG CANCER, WHEN PEOPLE DON'T HAVE SYMPTOMS THE POSSIBILITIES ARE LIMITLESS. >> Reporter: DR. LECIA SEQUIST IS PART OF A TEAM OF DOCTORS AND ENGINEERS FROM MASSACHUSETTS GENERAL HOSPITAL AND M.I.T. TRYING TO REVOLUTIONIZE CANCER DETECTION. MEET CYBILL, AN ARTIFICIAL INTELLIGENCE PROGRAM THE NAME INSPIRED BY THE ORACLES OF ANCIENT GREECE. >> WE DEVELOPED SYBIL, AN ALGORITHM THAT IS ABLE TO TELL WHO MIGHT BE AT RISK FOR LUNG CANCER ONE, THREE, FIVE YEARS DOWN THE ROAD. >> Reporter: LUNG CANCER IS THE LEADING CAUSE OF CANCER DEATH IN THE U.S., KILLING MORE THAN 127,000 A YEAR THE MASS GEN M.I.T. STUDY USING THREE SETS OF INDEPENDENT SCANS FOUND THAT CYBILL COUL ACCURATELY PREDICT WHETHER A PERSON WILL DEVELOP LUNG CANCER IN THE NEXT YEAR, UP TO 94% OF THE TIME >> THERE IS IMMENSE AMOUNT OF DATA IN A CAT SCAN, AND WE'RE ONLY SCRATCHING THE SURFACE WHEN WE ONLY LOOK AT IT WITH OUR EYES. >> Reporter: USUALLY A RADIOLOGIST IS A LOOKING FOR NODULES OR A MASS, BUT SYBIL HAS THE POWER TO LOOK SO CLOSELY AT A CT SCAN, IT CAN IDENTIFY PATTERNS OF DATA ASSOCIATED WITH CANCER EVEN BEFORE A TUMOR APPEARS. SO THIS IS AI IN ACTION WHAT DO WE SEE HERE? >> AI CIRCLED THIS AREA IN RED AND SAID THIS AREA HAS A DANGEROUS PATTERN. IT LOOKS LIKE CANCER MIGHT COME UP TWO YEARS LATER, THERE IS A CANCER RIGHT IN THAT SAME SPOT, WHERE THE AI PREDICTED IT WOULD BE. >> Reporter: THAT'S NOT TO SAY AI WILL REPLACE RADIOLOGISTS BUT THE RESEARCH TEAM IN MASSACHUSETTS BELIEVES SYBIL'S ASSISTANCE IS THE FUTURE OF THE FIELD. IS AI GOING TO SAVE LIVES? >> YES, IT WILL SAVE LIVES, BECAUSE IT WILL ENABLE US TO DO MORE, SEE MORE, AND MANAGE BETTER THAN WE DID WITHOUT AI >> Reporter: CLINICAL TRIALS FOR SYBIL ARE ONGOING. FDA APPROVAL LIKELY YEARS AWAY AND WHILE DOCTORS ARE STILL STUDYING THE TECHNOLOGY, DON ROBERTS, WHO IS NOW CANCER-FREE, BELIEVES TECHNOLOGY LIKE SYBIL COULD HELP HIM LIVE LONGER >> YOU NEED EVERY WEAPON YOU CAN POSSIBLY GET TO COMBAT CANCER. >> AND AI COULD BE A POWERFUL ONE? >> ABSOLUTELY. >> Reporter: DR. JOHN TORRES, NBC NEWS, BOSTON >>> WHEN WE COME BACK, WE'LL HIT THE RAMPS AND THE RAILS WITH >>> FINALLY TONIGHT, FOR SO MANY SKATEBOARDERS, FINDING SOMEWHERE TO SKATE CAN BE AS HARD AS LANDING YOUR FIRST OLLIE OUR STEVE PATTERSON REPORTS NAVAJO NATION WAS NO EXCEPTION UNTIL NOW. >> Reporter: THE NAVAJO NATION IS BREATHTAKING 27,000 SQUARE MILES OF QUIET BEAUTY BUT FOR KIDS GROWING UP HERE, MAYBE TOO QUIET. THAT'S WHY SO MANY ARE ATTRACTED TO THIS SOUND. NAVAJO NATION LOVES TO SKATE. JUST CHECK OUT THEIR PRESIDENT DOING AN OLLIE. >> YOU COME OUT, YOU SKATE. YOU CHALLENGE ON ANOTHER AND KEEP EACH OTHER ACCOUNTABLE. >> Reporter: BUT THE RESERVATION ITSELF HAS BEEN A SKATEBOARDING DESERT KIDS HAD TO FIND A RIDE DOZENS OF MILES AWAY JUST TO GET THEIR WHEELS RUNNING 12-YEAR-OLD CHEYENNE HAS BEEN DOING IT FOR YEARS. >> I JUST LIKE DOING IT BECAUSE IT'S FUN. IT'S TEACHING ME TO BE MORE ACTIVE. >> THESE REMOTE COMMUNITIES NEED MORE OPPORTUNITIES TO HAVE OUTDOOR RECREATION. >> Reporter: SOMETHING SKATERS COULD CALL THEIR OWN BECAME A COMMUNITY'S CAUSE, AND WITH ASSISTANCE FROM AN ORGANIZATION CALLED THE SKATE PARK PROJECT AND ITS FAMOUS FOUNDER TONY HAWK -- >> THANK YOU FOR BRINGING CHANGE IN THIS COMMUNITY. >> Reporter: -- THE DINEH SKATE GARDEN CAME INTO BEING. HOW IMPORTANT IS THIS IN A COMMUNITY LESS SERVED. >> I THINK IT'S EXTREMELY IMPORTANT IN A COMMUNITY LIKE THIS. WHEN KIDS FIND SKATEBOARDING, THEY FIND SOMETHING THAT SPEAKS TO THEM IN A DEEPER WAY, AND CAN TEACH THEM A LOT OF LIFE LESSONS ABOUT OVERCOMING YOUR GOALS, ABOUT OVERCOMING YOUR CHALLENGES. >> Reporter: NOW SOMEWHERE LIKE THAT EXISTS RIGHT HERE. >> I'M REALLY EXCITED FOR THEM SO THAT THEY CAN BE HERE, THEY CAN BE A PART OF THE COMMUNITY. >> Reporter: A PLACE OF PRIDE, A CULTURE OF TRADITION NOW EMBRACING THE GREAT SANCTUARY OF SKATE STEVE PATTERSON, NBC NEWS, NAVAJO NATION. >> THEY MAKE IT LOOK SO EASY. THAT'S "NIGHTLY NEWS" FOR THIS TUESDAY THANKS FOR WATCHING, EVERYONE I'M LESTER HOLT. PLEASE TAKE CARE OF YOURSELF AND EACH OTHER. GOOD NIGHT