"Blood samples are sacred," says Carletta Tilousi, a Havasupai Indian, and "a major part of our spiritual, cultural, and religious identity." The tribe was recently involved in a dispute that raised ethical questions about research subjects and the use of genetic material.
The story of a group of American soldiers, all conscientious objectors and Seventh Day Adventists, who volunteered to expose themselves to deadly viruses and bacteria, rather than go to war. Over a 20-year period, beginning in the 1950s, the army used them to test vaccines against biological weapons. Most of them recall the experience without regret.