With the addition of Pennsylvania and Ohio in 2016, the total number of states in America allowing the use of cannabis medically is now 25. The non-state known as the District of Columbia or Washington, D.C., the nation's capitol, also has allowances for medical cannabis.
They all have variations of what ailments or diseases are allowed for obtaining a medical marijuana permit. The states that are the most liberal include Colorado, Washington (state), and Oregon. They allow recreational use of marijuana, thus eliminating the need for approval from a bureaucratic medical marijuana approval system.
Some states have more restrictions than others. For example, in New Mexico, hepatitis C is a condition allowed for cannabis, but only if one is using an FDA approved medically prescribed anti-viral. In other words, only as an adjunct for interferon type drugs that have a history of nasty side effects.
This helps keep those who would rather avoid the medical system in it. Nearby Arizona allows cannabis for hepatitis C without the concurrent anti-viral treatment requirement.
But so far, only one state allows medical cannabis for those diagnosed with aggressive or destructive autism, Delaware.
Currently, a panel within the Minnesota Department of Health has met to discuss the possibility of including autism as a qualified condition for cannabis use. If you are a Minnesota resident and wish to register your supporting opinion or parental giver story with that panel, they are open to comments until September 20th.