Countless tissue samples are collected each day from patients in doctors' offices, clinics, and hospitals. Thousands of other samples are provided every day for biomedical research. In addition, numerous men and women in prison and in the military provide samples for purposes they hope will never be realized: conviction for crimes or identification of their bodies at death. In each case the blood, cheek cells, sperm and ova, or other type of tissue collected may be banked in biomedical labs for multiple purposes. The essays in this timely, thought-provoking book investigate the ethical, legal, and policy implications of these practices.