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Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.
Urine tests are the most commonly used, but the length of time that Xanax stays in this bodily fluid depends largely on how heavy abuse of the drug has been. For occasional users, a urine test will usually not work past 4 days, but in heavy users, it can detect the substance for up to a week. Saliva and blood tests work on a much shorter timeline. Though they can detect Xanax soon after a dose is taken, saliva tests only work for 2.5 days after the last dose, and blood tests are only effective for a day. Hair tests can detect Xanax for up to a month after the last dose as traces of the drug accumulate in the hair follicles. However, it takes much longer for a drug to appear in hair than in bodily fluids, so if a hair sample is taken too soon after someone takes Xanax, the sample may come back negative for the drug.