Thirty-five years ago, California voters approved a landmark law meant to halt exposure to dangerous chemicals in drinking water and everyday products like food, flip-flops, and face shields.

Decades later, the water cases are few and far between—while hundreds of product lawsuits bring in millions of dollars annually for plaintiffs’ attorneys, some of whom represent environmental groups focused only on this law.

The Safe Drinking Water and Toxic Enforcement Act of 1986—commonly known as Proposition 65— came into being during Ronald Reagan’s time as president, when the U.S. Environmental Protection Agency was slashing regulations and loosened enforcement of pollution standards.