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Yes, fentanyl can be detected in the body four days after the last use, depending on the testing method used. In urine tests, fentanyl may be detectable for 1 to 3 days after use, but in some cases, it can be identified for longer periods, especially with more sensitive tests. Blood tests typically have a shorter detection window, while hair follicle tests can detect fentanyl for much longer, potentially weeks to months. Factors such as dosage, frequency of use, and individual metabolism can also influence detection times.

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1mo ago

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