In a little over one month, Vermont will become the first state in the nation actually requiring the labeling of foods containing genetically modified organisms (GMO).  The Vermont mandate was signed into law just over 2 years ago and immediately challenged by the Grocery Manufacturers Association along with the Snack Food Association, International Dairy Foods Association and the National Association of Manufacturers.  Notwithstanding the heft of the plaintiff groups, their request for a preliminary injunction to stop the law from going into effect while the challenge is pending was denied by the U.S. District Court of Vermont just over one year ago.  Subsequently, the plaintiffs appealed the denial of an injunction, but that appeal has yet to be decided.  Consequently, unless the appellate court rules in favor of the plaintiffs within the next 6 weeks, the labeling law will technically become effective on July 1 with a six-month grace period of sorts until January 1, 2017 to allow businesses to comply. Other states, notably Maine and Connecticut, have passed mandatory GMO labeling laws, but neither becomes effective unless other specific states also enact the requirement.  To date, they have not.  Aside from the court challenge, there is an effort ongoing in Congress to implement a national voluntary labeling program and to prohibit individual states from enforcing their own labeling laws, but to date, that effort has not been successful with the US Senate most recently voting against the House-approved proposal on a 48–49 vote in mid-March.