While the article claims that the volunteers ate pinto beans in order to produce the necessary output for the test, considering that it was done in Minneapolis I'd guess that there were at least some residules of brats, cheap beer and (maybe) lutefisk involved. No wonder hydrogen sulfide was the principle byproduct. A New Mexico green chili fart is quite another thing entirely...tart and strong enough to eat the lining from your nostrils!

By the way, Seamus Kennedy has a lovely little ditty about farts....