Not all, but many of these concerns are drummed up by people that want to add every conceivable resistance to wealth redistribution possible, and the rubes that believe their fabricated justification. Drug testing for food and housing assistance is a great example. A fraction of the amount of money spent gets “saved” and the rare addict thrown off will probably cost the system more money as a homeless addict. Ultimately, it comes down to contempt for people who have less, and wanting to see them humiliated.