I work evenings and weekends at K-mart around my day job. It's not tough to get hired if you can work the hours they need and they are hiring when you apply.
They do not drug test. If so a lot of their employees (including me) would be out of work. What they do is have you answer questions, including about drugs, on your application. If you are smart enough to give them the answers they expect, then you might get hired. If you give them honest answers, then you are either a dumb ass who won't get hired or maybe you will get hired because you have never done or thought nothing wrong. act like a boy scout when you apply and you have a good chance.