THC metabolites are excreted mostly through the stools with the rest through the urine. HIGH fiber foods and/or metamucil help direct the metabolites towards the stools instead of the urine. Research the foods high in fiber and low fat. This is NOT saying it will eliminate all metabolites, but it may be that percentage that you would had needed to pass. Make sure you stay hydrated (not water loading till day of test)....That helps in MANY, MANY ways.