Ketamine was first developed in 1962. It is on the World Health Organization's List of Essential Medicines, the most important medication needed in a basic health system. It is legally sold under a very wide variety of brand names, including Ketalar.
If the crime you commit (generally just first degree murder) is in a state that does not have the death penalty then the only way you can be executed is if you are tried in a federal court as opposed to a state court.
Juveniles and the Death Penalty. ROPER v. SIMMONS, No. 03-0633. In March 2005, the United States Supreme Court ruled that the death penalty for those who had committed their crimes at under 18 years of age was cruel and unusual punishment and hence barred by the Constitution.