Drug Testing for Social/Disability Assistance

I am in a bun-fight right now with someone who insists no one without an obvious physical disability should be excused from work and thereby collect assistance. They have also been adamant that any who are should be undergoing mandatory drug testing.

I have tried to argue against this including pointing out the need some with mental health issues have to self medicate, or to engage in risky behaviour, etc. He just doesn't get it.

Sounds like an idiot showing his ignorance and stupidity.