you will have an personnel interview...will you tell the truth or not?.....one side be honest and it might work well,or lie and they might know the truth and you will fail....

If you haven't used in five years it's not going to show up in a urine test, so you are safe there. You said used but not busted for high school use, still no problem. A criminology degree is helpful. Can you be a cop? Gotta pass the physical and get through the academy but other than that you have not related anything that would keep you from being a cop.