well a friend I know used a small cup to pass his urine test. the cup was little so it was easy for him to fit it in his pants. Using a straw he made seem like he was pissing. But me personally, all I did is drink a SHIT load of water and I passed. Both ways are preatty risky.... and u cant be sure for 100% that they work, but it worked for us so if you put you effort in2it it should work. Good luck