Typhoid Mary was locked up for life a century ago. When someone is chronically ill with a dangerous, infectious disease, their mental illness isn't the reason t

Typhoid Mary was locked up for life a century ago. When someone is chronically ill with a dangerous, infectious disease, their mental illness isn't the reason to lock them up, their infectiousness is. Mary Mallon doesn't seem to have been mentally ill, just in denial of the impact of her actions, and so poor that she couldn't afford not to cook. It seems to be legally sound and hasn't caused a slippery slope since that very famous case.