Army Staff Sgt. Robert Bales, who killed 16 Afghan civilians last year, had been given the anti-malarial drug mefloquine hydrochloride even though he had previously sustained a TBI, according to his attorney. An adverse event report from the FDA describes a scenario similar to that of Bales, although he is not mentioned by name. The drug, which military rules state should not be given in cases of TBI, can cause neurological side effects in 5% to 10% of users. Bales was also taking steroids, was under stress, may have been suffering from psychological trauma and could possibly have been drinking, according to witnesses.