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Typically, it is possible to detect methadone in the urine for 2 to 4 days after it has been used, which implies that this is the period for which methadone stays in your system. On the other hand, the detection window of methadone in blood is approximately 24 hours, while that in saliva is about 1 to 10 days.
Special Notes For The Methadone Hair Drug Test: The benchmark drug detecÂ­tion time for the methadone hair drug test is 90 days. Sometimes a longer hair sample is taken, which can result in a 120 day detection time. This is rare, but you can never count it out.