Well first of all, if you havnt smoked in a year, you're clean. Second, keep some quick fix on you at all times if you're really concerned about it. If it's unsupervized, just mix it up and let it warm between your legs and under your nuts... I know it's a huge hassle, but it's either keep the fix on ya or stop smoking the herb....

Or get a job where employers respect your fucking personal life.