1. Source: United States v. McIntosh 16 2016
2. State marijuana laws in 2016 map Governing the States and Localities website http://www.governing.com/gov-data/state-marijuana-laws-map-medical-recreational.html 2016
3. see reference #2
4. See, eg Cal. Bus. and Prof. Code, Article 25
5. See US Const Art. VI, cl. 2 (the “Supremacy Clause”)