the schemes in the UK where heroin addicts are supplied with fresh needles and clean surroundings to shoot up.
Much better that using dirty needles in some empty flat with neighbours around. They're going to do it anyway, so why not be practical about it and let them do it safely?
They should work for their keep!
Like a form of slavery you mean? If they were going to be any good at that, they probably wouldn't be tramps, would they?