In 1996 Arizona citizens bypassed lawmakers; and won the “voter initiative measure” legalizing medical marijuana. Though it passed by a margin of 65% our State Legislature destroyed that law. This forced citizens to again battle and bypass lawmakers to pass Prop 105 in 1998: “Arizona Voter Protection Act”. Though this law was a specific reaction to the sabotage of the 1996 medical marijuana law, Prop 105 generally prevents adversarial government from vetoing or obstructing laws that citizens initiate and voters approve.
In 2010 citizens again forced a vote for Medical Marijuana in Arizona and prevailed. This is why when you read the language of Prop. 203 you will repeatedly see this warning in captions: (Caution: 1998 Prop. 105 applies)