With the legalization of medical marijuana becoming increasingly common in many states, the medicinal potential of formerly illicit drugs has caught the public's attention. However, marijuana is not the only drug being researched and used medicinally: MDMA, psilocybin, and ketamine have been found to have therapeutic qualities, which leads some to question whether the medical use of these substances may also be legal in the future. This volume helps readers explore issues like regulation, the ethics of using illicit drugs in medical and scientific research, and its place in the greater history of drug regulation in the United States.