Breathing Problems Sideline Kentucky Derby Favorite

The early favorite to win the Kentucky Derby has been sidelined because of a breathing problem. This year's derby comes after a report said 43 horses have died due to racing injuries at Churchill Downs since 2016. So what's causing all these deaths? Here & Now's Peter O'Dowd speaks with Caitlin McGlade (@CaitMcGlade), investigative reporter for WFPL in Louisville, Kentucky.