yes you would, pry not if you only did it once or twice in past year. if worried go to a local smoke shop that sells like glass bowls, or perhaps gnc, I prefer Pure Pleasure. I bought a shampoo from...
the 5 things they usally test for (called the nida 5) are marijuanna , cocaine, phencyclidine (pcp), opiates, amfetamines. so go eat some acid or mushrooms and be safe!