Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
Dr. Sanjay Gupta says a hospital may have exposed 18 people to Creutzfeldt-Jakob disease through contaminated instruments.
Dr. Sanjay Gupta reacts to the Justice Department's announcement that it won't block laws that have legalized marijuana in states like Washington and Colorado.
Dr. Sanjay Gupta explains why mixing drugs can be fatal, and why it is so difficult to recover from heroin addiction.
RELATED STORY: Coroner: Mix of heroin and alcohol killed 'Glee' star
Dr. David King had finished running the Boston Marathon when the bombs went off, and he rushed to the hospital to help.
CNN's Dr. Sanjay Gupta talks to Wolf Blitzer about pictures of Albert Einstein's brain that were just released.
Dr. Sanjay Gupta goes to Massachusetts to get answers from the facility that made the contaminated injections.