The Poison Squad: An Incredible History - Esquire: The human lab rats were “twelve young clerks, vigorous and voracious.” All were graduates of the civil service exam, all were screened for “high moral character,” and all had reputations for “sobriety and reliability.” One was a former Yale sprinter, another a captain in the local high school’s cadet regiment, and a third a scientist in his own right. All twelve took oaths, pledging one year of service, promising to only eat food that was prepared in the Poison Squad’s kitchen, and waiving their right to sue the government for damages -- including death -- that might result from their participation in the program.
Squad members needed a lot of patience. Before each meal, they had to weigh themselves, take their temperatures and check their pulse rates. Their stools, urine, hair and sweat were collected, and they had to submit to weekly physicals. When one member got a haircut without permission, he was allegedly sent back to the barber with orders to collect his shorn locks. Most of the squad members didn’t get extra pay for their hazardous duty: in return for their patience and obedience, they received three square meals a day -- all of which were carefully poisoned.