If your results are inconclusive, you can place the sample into a mailer that comes with the kit and send it off to a lab for final analysis. You can get the results after three days by calling a help line and providing an identification number. Not every positive test result means that illegal drugs have been used. For example, certain foods and medicine may cause a positive result. You can even test positive for marijuana if you've been in a room with heavy marijuana smoke, even though you haven't smoked the weed yourself.
Some people are sensitive to the metal.
This can cause irritation, sores, a burning sensation, even headaches and fatigue. Chances are if you're allergic to metal, you also find it difficult to wear a watch or jewelry. Eileen Nechas and Denise Foley are health columnists and authors of four health books.