come on now. what place is going to spend the lab money to check a teenager thats getting paid minimum wage?
There are DQ's around my area that drug test. The op's question was a valid one. No one here can give you a definite answer cause Dairy Queens are franchised out, so it really depends on what the individual store owner wants to do.
i can tell you that both of the dairy queens i worked for did not drug test, because if they did, a good portion of their staff would no longer be employed.