Pulmonary expert: George Floyd died from a lack of oxygen

On Day 9 of testimony in the trial of Derek Chauvin, a top medical expert, Dr. Martin Tobin, said George Floyd died from a lack of oxygen, and that fentanyl was not a factor. New York Law School professor Kirk Burkhalter spoke with CBSN's Tanya Rivero about what the medical expert's testimony means for the trial.