if someone is on methadone at a clinic, and is taking the monitored amounts there, is there a drug test that I can buy at home that will not test or recognize the methadone, so that I can determine if other drugs (specifically opiates) are being used?? Or will all home tests pick up on the methadone, making it impossible for me to tell if other drugs are present? I am aware of the methodone use, obviously, so can someone hide behind that messing up a home test?? Thanks