Substances that may cause this toxidrome include substituted amphetamines, cocaine, and phencyclidine. Some psychoactive drugs such as LSD, methaqualone, or phencyclidine ("angel-dust") can cause hyperacusis. Phencyclidine (PCP or angel dust) is available as a street drug. Recent years shows an increase in the consumption of vaporized heroin, methamphetamine and Phencyclidine (PCP). Neither phencyclidine nor haloperidol have any appreciable chemical similarity to the opioids. Phencyclidine (PCP) is Schedule 2 on the California Uniform Controlled Substances Act. It is similar in effects to phencyclidine (PCP) but is considerably more potent. Phencyclidine (PCP) is cited by the article as a drug popular in Sunnyside. It is closely related to phencyclidine (PCP), and specifically, is a derivative of tenocyclidine (TCP). Rhesus monkeys were trained to self-administer cocaine or phencyclidine, then were offered dizocilpine instead. Phencyclidine is used for its ability to induce a dissociative state. After being detained, Rojas was found to have ingested phencyclidine before the crash. It is similar in effects to phencyclidine but is slightly more potent. Bromobenzene is used as a precursor in the manufacture of phencyclidine. Unlike the other well-known dissociatives phencyclidine (PCP) and dextromethorphan (DXM), ketamine is very short-acting.