Where could I find alcohol strip testers?

My husband is always drinking, he promised if quitting beer is what it took to keep me and the baby he would. But I don't believe that he isn't drinking, because of the experience i have knowing what his voice sounds like when we used to party. Does anyone know if there are dip stick testers I can put some of his urine on to see if he is a liar. If he is I'm out for sure.