Not in the US, but In Mexico, it is legal to do so and Mexican law applies to Americans as well while in Mexico. Family members have conservatorship rights automatically. That means a family member is allowed to place an addicted loved one in the care of a treatment center without their consent. On top of that most of the treatment centers, South of the border does not allow clients to leave until the completion of their program. This can be anywhere from 30 days to a year. The situation is saving lives and giving family members control for once.