id talk to the employees about the random drug testing. sometimes they say that as a scare tactic. i know from my first job where i work for like a year and a half they had signs up by all the place to clock in that warned about random drug testing but during that time no one was tested, and people that had worked there longer there me said they had never seen it happen. also i have friends at different jobs where the exact same thing has happened. definitely ask the other people who work there about it, unless you are already sure they do