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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.
According to LabCorp, for a methamphetamine urine drug test, the detection period is 3 to 5 days; for a hair test it is up to 90 days and for blood and oral fluid, it is within 12 hours.