Why do conservatives support drug testing for those receiving welfare?

I understand your argument, and you do have a very good point. I'm a moderate. The only reason I could think of as to why conservatives would want to drug test welfare recipients is because conservatives don't want druggies taking tax dollars just to get high again. Also, maybe if it is shown that a large number of people on welfare are drug-takers, it could be detrimental to the public image of Democrats and left-wingers (or the political groups that support more welfare). Furthermore, drugs breed crime. The government might be paying for crime to occur.