The idea is very laudable. But it hasn't a hope in Hell's chance of working. In fact, if anything, it may cause more cross contamination than it solves. Imagine this - a homeless person who has spent some time on the streets. Although it may not be his choice, he is used to being outside. Suddenly, not only is he to be confined to barracks (probably a small room) but he is not allowed out except for essential purposes. It's not going to work. Many of them - especially now the weather is improving - will simply not cope with their confinement, will leave the premises and, even if they come back, will mix with their fellow homeless when out and about.