Phenol, a dangerous substance often used as a sanitizer. Workers loaded a cart past what it could carry, and the cart broke, emptying the contents into the water. Only time will tell us if there are lasting damage to them or the waters. Had their condition not presented its self so readily, I doubt something would have been done.

[ Sherlock has seen what companies can do to the less fortunate, and those people were simply scavenging to survive. ]

Arsenic is not just for stories. I've dealt with real cases using the poison.

[ He'll pour himself another cup of coffee. While he may have forgotten why he's brewing so much coffee for the moment, he does not forget the need to Avoid Sleep Forever. ]