I've seen fast food restaurants do this in the US to positive results. (I've never seen a 100% staffed place, but they worked with local non-profits who worked

I've seen fast food restaurants do this in the US to positive results. (I've never seen a 100% staffed place, but they worked with local non-profits who worked with the intellectually challenged.) The advantage is a loyal workforce. The disadvantage is that these workers have more difficulty with change and optimization, and often do not have the same top-end speed in a rush. In a depressed economy such as this (on the low end) it's possible to find motivated workers who don't have the same challenges.