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is metabolised in liver
and excreted by kidneys, if these organs are affected then it may take more time particularly in obese
Diazepam and it's metabolites are excreted completely within 5days after a single dose.
If you are taking sleep medicines like alprazolam/lorazepam
then they may also give a positive test.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!