From the September 19, 1911 Brooklyn Daily Eagle:

“San Francisco–Destitute and hungry, William Murphy entered a local grocery store last night, hoping to purloin something to eat. The proprietor was called to wait on a customer and Murphy seized the opportunity to gobble two sandwiches he found on the counter. He was seized with convulsions a few minutes later and was taken to the emergency hospital, where it was found he was suffering from arsenic poisoning. The sandwiches he had eaten had been prepared to bait a rat trap. Murphy probably will recover.”