Federal officials have zeroed in on the cause of the radiation leak at the government’s nuclear dump in New Mexico. It’s kitty litter! Los Alamos National Lab packed hundreds of barrels with the stuff. Some made it to the dump. Others went to storage in Texas. And still more are at the lab. It’s thrown the nation’s nuclear waste system into chaos. Edwin Lyman is a Senior Scientist with the Union of Concerned Scientists. He joined Tom Temin and Emily Kopp on the Federal Drive with an update on the situation in New Mexico.