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05-14-2009, 02:09 AM
Depending on how you take them? PRN or as needed may mean you only take them randomly. Does that mean you skip a day or more at a time? The metabolites are measured up to a certain parameter, hence, a negative is not a negative it simply means that you have not reached the drugs starting point for testing. So what the test is really saying is that you are not abusing them and your metabolites have fallen below the starting point for the test. Another possibility is that they are doing randoms and not testing for every drug each time, or if you declared that you are taking them they may have opted not to test you for it.
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