OUTSIDE D.C. INJURED SEVERAL PEOPLE. PRESIDENT BIDEN IS SPEAKING OUT TONIGHT ABOUT WHETHER OR NOT HE WOULD PARDON HIS SON IN HIS FEDERAL GUN CASE, AS THE JURY HEARD FROM THE GOVERNMENT'S KEY WITNESS, THE PRESIDENT'S OWN DAUGHTER-IN-LAW, HALLIE BIDEN. CBS'S SCOTT MacFARLANE WAS INSIDE THE COURTROOM AS SHE TESTIFIED ABOUT HUNTER BIDEN'S DRUG USE AND THE GUN AT THE CENTER OF THE CASE. >> Reporter: A STAR WITNESS IN A POTENTIALLY PIVOTAL PIECE OF VIDEO EVIDENCE AT THE TRIAL OF PRESIDENT BIDEN'S SON, HUNTER. HALLIE BIDEN, THE WIDOW OF HUNTER'S BROTHER, BEAU, TESTIFIED THIS SURVEILLANCE VIDEO SHOWS HER THROWING AWAY HER BROTHER-IN-LAW'S GUN IN A DELAWARE GROCERY STORE PARKING LOT ON OCTOBER 23RD, 2018, JUST 11 DAYS AFTER HUNTER BIDEN BOUGHT THE GUN AND JUST AFTER HALLIE BIDEN SAID SHE FOUNDED IN HUNTER BIDEN'S CAR ALONG WITH DRUG RESIDUE AND DRUG PARAPHERNALIA. HALLIE TESTIFIED, "I DIDN'T WANT HIM TO HURT HIMSELF OR THE KIDS TO FIND IT AND HURT THEMSELVES. I WAS PANICKING." PROSECUTORS ARE TRYING TO PROVE HUNTER BIDEN WAS ADDICTED OR USING DRUGS AT THE TIME HE FOUND THE GUN, LYING ON THE FEDERAL GUN APPLICATION. >> PROSECUTORS WILL TELL YOU THE PHYSICAL EVIDENCE DOESN'T LIE, AND THIS IS ABOUT AS POWERFUL PHYSICAL EVIDENCE AS YOU CAN GET, LINKING HIS POSSESSION OF THAT GUN TO HIS USE OF ILLEGAL DRUGS. >> Reporter: HALLIE BIDEN ALSO DESCRIBED TAKING UP A ROMANTIC RELATIONSHIP WITH HER BROTHER-IN-LAW ABOUT A YEAR AFTER HER LATE HUSBAND BEAU BIDEN'S 2015 DEATH, TELLING THE JURY IT WAS ALSO HUNTER BIDEN WHO INTRODUCED HER TO USING CRACK COCAINE, CALLING HER DRUG USE "A TERRIBLE EXPERIENCE, I'M EMBARRASSED AND ASHAMED." PROSECUTORS SHOWED HALLIE BIDEN THE GUN, AND IMAGES OF THE SATCHEL IN WHICH SHE FOUND AND DISCARDED IT. BUT HUNTER BIDEN'S ATTORNEY, ABBE LOWELL, TRIED TO SHOW HALLIE BIDEN DIDN'T ACTUALLY KNOW WHAT HUNTER WAS DOING THE WEEK HE BOUGHT THE GUN. "YOU DON'T KNOW IF HE WAS DRINKING, USING, OR EITHER OF THE ABOVE," LOWELL ASKED. "I DON'T KNOW," SHE RESPONDED. HUNTER BIDEN FACES THE PROSPECT OF PRISON TIME IF CONVICTED ON THESE CHARGES. IN AN INTERVIEW TODAY, PRESIDENT BIDEN RULED OUT A FUTURE PAR
