How Do Standard Drug Tests Work? A standard drug test is a five-panel drug test that looks for marijuana, cocaine, PCP, amphetamines, and basic opiates like codeine, heroin, and morphine. Many companies and screeners will also look for: Barbiturates Benzodiazepines Methadone Propoxyphene Methaqualone Ecstasy Hydrocodone Oxycodone Demerol Tramadol Urine drug screens are the most common … Continue reading Drugs That Are Not Detectable on Drug Tests