Here's where we'd love to tell you all about the psychopath who hatched this scheme, and their method, and why they did it. Too bad -- nobody fucking knows. A serial killer who took a dozen victims (that we know about!) and could have had three dozen more if they'd ingested more of the toxin and/or didn't get help in time, may still be out there today. Shit, for all we know, only the first couple were this guy and the rest were copycats (which would actually be even more alarming, the idea that it just became a fad).
After they figured out what was happening, the vending machine company began attaching stickers to the machines that warned customers not to, you know, consume mystery drinks that they might find inside. The poisonings pretty much stopped overnight. Which is great, except that any leads the police might have had in the case dried up as well. No arrests were ever made, which means that there's probably some guy in Japan right now chugging a bottle of Oronamin C and musing on his brief serial-killing hobby. Or, you know, he's still killing people using some other method.
Christina Chun/Honolulu Star-Advertiser
Keep him away from any and all jars of Kit-Kats.