Angel Dust is also known as PCP. It is known as a Hallucinogen, but has the effects of a stimulant, an anesthetic, or a narcotic pain-killer, depending on the amount taken. PCP has been used as an anesthetic, medically; first on humans and later on animals.
An injunction is a court order that compels an individual or entity to do, refrain from doing, or to stop doing, a specified thing. When filing a civil lawsuit, the plaintiff must specify what relief he is seeking from the court. Many civil lawsuits in the United States seek monetary compensation, or money damages.
The injunction applies only in Missouri; it is one of the first cases in which an operational state law, passed after the ACA became law, was halted because it contradicted the federal law. Read the legal analysis for Missouri in Health Affairs by Tim Jost.