This is an old thread. That person is long gone.Well it all depends on your body fat content how much you smoke whether you need to dilute with water or not. FAKE PEE WONT WORK FOR A PROBATION URINE ANALYSIS SINCE THEY HAVE TO VIEW YOU MAKE CONTACT FROM YOUR PRIVATE PARTS TO THE CUP SOO PLEASE STOP SUGGESTING IT. A combination of water cranberry pills as well as niacin ( no niacin the day of) will help you pass certo is only good for a three hour window. I weigh 120 pounds height has nothing to do with ot but im 5'8" i have passed two test ( for probation) so far and the following day took a home test. I passed the probation test but failed the home test. Taking a multivitamin or a b complex vitamin will help you from failing for dilution.