Amphetamines describe the category, or drug class, that includes both amphetamine and methamphetamine. While the U.S. Department of Transportation (DOT) and Substance Abuse and Mental Health Services Administration (SAMHSA) requirements include MDMA under the group “amphetamines,” laboratory testing typically requires a separate, specific test.
So sometimes oxycodone will show up on an opiates test, but not with the same accuracy as it shows up on an OxyContin / Vicodin test. The OxyContin / Vicodin test specifically tests for oxycodone in urine, so is much more reliable for that purpose than the opiates test, which detects morphine in urine.
Phencyclidine (PCP) was developed as an intravenous anesthetic but was discontinued in 1965 because of serious adverse effects on patients. As a Schedule I drug, PCP is a “dissociative drug” that can cause unpredictable behavior, increased pulse and heart rate, heightened blood pressure and temperature, possible mood and perception alteration, paranoia, panic, anxiety, nausea, tremors and suicidal urge.