05/24/2010 01:43:00 AM EST
Drug Tests Often Give False Positives, Certain Opioid Drugs Not Screened
NEW ORLEANS, LA - At a recent American Psychiatric Association's annual meeting, Dwight Smith, MD, of Boston Medical Center, gave a presentation on how drug abuse tests often give inaccurate results and how most standard drug tests don't screen for various opioid drugs, including oxycodone, methadone and fentanyl. Dr. Smith pointed out how poppy seeds, cold medications, and antidepressants can give false positives, and how the HIV medication efavirenz can show up as a positive for marijuana use. Dr. Smith also noted the lack of federal guidelines for minimum negative threshold levels for a positive test.