I was on federal paper having to use a color code system.I had to call a number at a certain time every day.If my color was called I had a time limit to get downtown to pee.It works if you do it right.One package of certa which is whats in jello 32 ounces of hot water drink it all down "it taste like shit" followed by another 32 ounces of warm water .Now,,you have to coat your stomache with something a little greasy.The article I read suggested a sausage biscuit from Mc Donalds or B.K. You are gonna feel like you gotta shit and you do but dont.You have to empty your bladder completly.Drink one more glass of water=32 oz. When your taking your test,,you only want midstream piss in other words piss a little in the toilet then piss in the cup then before you finish piss the last part in the toilet.ONLY THE MIDSTREAM.I have passed everytime .This only works with the strips if they send it to a lab, your fucked!Good luck.