Why shouldn't recipients of public welfare money be required to take a drug test?

http://www.politico.com/news/stories/0911/62977.html

We are not talking about testing for cold medication.

We are talking about testing for drugs that are certainly bought on the the street with money.

Some of it is MY money. And if somebody is getting my money without my personal charity imprimatur, I at least want to know that it is not being handed to some hustler in exchange for shit.

The constant argument is that it violates the fourth amendment. Please, give me break. The SC already said the amendment’s protections do not apply when the searched party lacks a “reasonable expectation of privacy”. And since they are spending “public” not “private” money, there goes the expectation of privacy.