Alright, I'll give it a shot.
One of the major problems I have with drug testing is how inaccurate they have been. If someone had the poor judgment to eat a poppy seed bagel within the past few days, they could get a life-ruining false positive. Even assuming they could perfect the test, what exactly does it gain to find out someone smoked a joint within the past week? Was it affecting their work? Were they hurting anybody? You wouldn't need a drug test to figure out if an employee was becoming a liability. I think there are only a handful of professions that could benefit from drug testing (pilots , for example); others I think are completely unnecessary, degrading, and bordering on an invasion of privacy.
You'll have to explain why people on welfare should be tested for drugs, because I have the feeling this is an excuse to stop giving them money. The Republican's attitude has always been that welfare recipients are nothing but leeches anyway, so any excuse to cut them off would be just fine with them.
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