Does UPS drug test?

I got a interview tomarrow for Drivers helper at UPS. I just wanted to know if they drug test or not? I don’t smoke all the time. I was at a party about a week ago and smoked. Then I got a call from UPS today for an interview. I have been pretty good about not smoking for atleast two months. I have no intention of smoking anymore either. It was just a one time thing.