- Overdoses are the most common cause of unintentional death in America today
- Dr. Sanjay Gupta says most of the blame belongs to American doctors
(CNN)Veteran doctors don't need a blood test to tell when someone is on the verge of a drug overdose. They can even narrow down the culprit by observation alone. Dilated pupils mean cocaine, amphetamines, maybe LSD. Constricted pupils mean an opiate.