Almost all the info i have gotten online about benzo’s showing up in drug tests has failed to differentiate between them. In my own personal experience clonazepam (Klonopin) is out of your system in about 24 hours, lorazepam (Ativan) and alprazolam (Xanax) in about 1 to 3 days, and diazepam (Valium) seems to stay in forever and a day, like maybe 7 to 14 days i’d say. All the info i have seen on methadone indicates it is out of your system in about 5 days, but healthcare and substance abuse professionals have led me to believe it can persist well over a week. Regular opiates (Oxycontin, Heroin, Vicodin, Percocet, Morphine Sulfate, etc.) can be eliminated from your system quickly by drinking tons of water and liquids such as green tea and cranberry juice, due to the fact that opiates are water-soluble. So instead of detection times lasting about 72 hours you can easily cut this time in halfwith patience and repeated trips to the bathroom. All of this is from my own experience. Hope it helps.