The drinks are regulated more loosely than traditional sodas such as cola.

WSJ: Energy-Drink Makers Face New York Probe

U.S. regulators have capped caffeine at roughly 6 milligrams an ounce for traditional sodas such as cola under a decades-old rule, but haven't done the same for energy drinks, many of which are marketed as dietary supplements and subjected to less government oversight.

WSJ: Investors Get Jittery Over Monster

In New York we get a mayor who makes war on Big Gulp sodas while proving himself inept at basic government functions such as clearing snow.

WSJ: McGurn: Sandy and the Failures of Blue-Statism