you will have to be patient, however if you are freaking out stop freaking out. do not smoke until u get your results, if they wanna retest of the swab dont do anything to try and adulterer it. as adsad said ur good usually after 48 hrs (not sure where i seen it but I've seen up to 72 hrs) but def only recent use. im willing to bet big those test kits dont test for Listerine beacuse thats an everyday product way to many people use to give them a fail beacuse of it(if anything at all they will have you retest.