Under the 1933 Law for the Prevention of Genetically Diseased Offspring, Nazi health officials required the sterilization of some 400,000 individuals suffering from presumed hereditary conditions, including schizophrenia, epilepsy, genetic deafness or blindness, and chronic alcoholism. Procedures including X-ray, surgery, or drugs intentionally removed a person’s ability to reproduce. Experiments with sterilization methods took place in several concentration camps between the years 1941 and 1945.