The following is an excerpt.
Here is the pattern: a grassroots effort builds over time to enact local or state laws (such as gun control, indoor-smoking laws, or restricting alcohol sales), and industry fights these efforts for years, until they can no longer win. At that point, industry lobbyists turn around and either get their own weak bill passed, or work with advocates to pass a compromise version. In exchange, this law will preempt or prevent any state or city from passing a different or stronger law. Forever.
View the original article here: Will a Federal Compromise on GMO Labeling Trump State Law, Forever?