"Weed 2: Cannabis Madness: Dr. Sanjay Gupta Reports", premiering Tuesday, March 11 at 10 p.m. ET, looks at U.S. federal laws that consider marijuana a drug with no medicinal value and serious scientists who say they're wrong. It is the politics of pot - the politicians vs. the patients.

Anderson Cooper reviews the tragedy of the killings at Kent State University in Ohio on May 4, 1970.

In a searing installment of her Black in America series, award-winning journalist Soledad O'Brien uses graphic videos and incisive interviews to show how the lives of young Black and Latino men are fractured by aggressive policing.