Jobs that require drug testing are those that affect public safety.

I don't think you can make that case for welfare recipients. They might be a danger to themselves, but they're not really a threat to public safety.
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She was standin' alone over by the juke box, like she'd something to sell.
I said "baby, what's the goin' price?" She told me to go to hell.

Bon Scott - Shot Down in Flames