In 1931 Vermont was the 29th state to pass a eugenics law. Vermont like other states, sterilized some patients in institutions and persons it had identified through surveys as degenerate or unfit. It nominally had permission from the patients or their guardians, but abuses have been documented. Two-thirds of the sterilizations were done on women, and poor, unwed mothers were targeted, among others. The surgery was performed at institutions and hospitals in the state supposedly devoted to care of people in need. There is disagreement about how many sterilizations were performed; most were completed from 1931 to 1941, but such procedures were recorded as late as 1970.