New Mexico was the first state to allow the medical use of marijuana, in 1978, but through a federally-approved research program.
In April 2007, Gov. Bill Richardson signed into law Senate Bill 523, the “Lynn and Erin Compassionate Use Act”. The bill allowed the use of cannabis with a physician’s recommendation for treatment of certain medical conditions such as HIV/AIDS, cancer, glaucoma, multiple sclerosis, epilepsy, and some spinal-cord injuries.
A bill to legalize the recreational use of marijuana passed the House in March 2019, and Senate Bill 323, for decriminalization, went into effect July 2019.