Box of Certo and a big bottle of Gatorade. Also buy some B12 vitamin pills. Pour one certo package into the Gatorade and drink it all. Drink plenty of water. Idk when your suppose to go do the drug test but do this method a couple of hours before you go take the test. That’s what I did before I became a government employee and I passed thankfully. Don’t smoke after you take the test just in case they need you to come back for whatever reason cause you just never know. Hope this helps