Conduct random testing at least yearly and more often if the patient is at additional risk for misuse or diversion for sale. The preferred testing strategy uses a combination of an enzyme linked immunoassay (EIA) for abused illicit substances and gas chromatography/mass spectroscopy (GC/MS) or liquid chromatography/mass spectroscopy (LC/MS). Tolerance, https://helenr471mve6.muzwiki.com/user