Firstly, a fentanyl patch once removed will never adhere properly again. If a patch starts to delaminate from skin the best way to stop it is to use that ultra thin flexible dressing cover (I've heard of it being called a bioclusive dressing (I used to buy it in 10cm x 1m roll (~ 3" x 3.5'). I believe the 'presence' of fentanyl can be detected in urine if Fentanyl is on the patholgy test form. The definitive test is a blood test that determines the QUANTITY of Fentanyl in blood plasma which is tested by gas chromatography. To subvert this test requires quite some skill that very few people would have. When I was taking Fentanyl, my random drug tests would start with an initial urine test and three blood collections over three days.
If you need clarification on any part of this, please don't hesitate to ask.
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