Urine test to work/Urine test for Welfare, right?

I read something like this earlier and it got me to thinking:

I am required to submit to a periodic urine test as a condition of my employment.
Like a lot of folks in this state, I have a job. I work, they pay me. I
pay my taxes and the government distributes my taxes as it sees fit. In
order to get that paycheck, I am required to pass a random urine test
with which I have no problem.

What I do have a problem with is the
distribution of my taxes to people who don't have to pass a urine test.
Shouldn't one have to pass a urine test to get a welfare check because I
have to pass one to earn it for them? Please understand, I have no
problem with helping people get back on their feet. I do, on the other
hand, have a problem with helping someone sitting on their ASS, doing
drugs, while I work. . . . Can you imagine how much money the state
would save if people had to pass a urine test to get a public assistance
check?