For news on the first alleged Proposition 65 violation concerning 4-Methylimidazole (4-MEI) in soda, see my blog posting in the environmental law blog.  4-MEI exists in some food and beverage products, including certain sodas, beers, soy sauces, breads, and coffees, among others. 

http://www.californiaenvironmentallawblog.com/first-prop-65-notice-of-violation-issued-regarding-4-mei-in-soft-drinks/