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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.
In a urine test, the typical detection time is 7-10 days, which is considerably longer than the 2-4 days for morphine. There are even reports of maintenance users showing positive for methadone 10-30 days after their last use. Saliva tests are much easier to pass, with the detection time typically being only 24 hours. Hair tests, however, are a different matter.