The Ann Arbor Hospital murders were the murders of 10 patients by unauthorized administration in their IV of the curare drug Pavulon in an Ann Arbor, Michigan, VA hospital in 1975. After a vast FBI investigation into the deaths, the nurses Filipina Narciso and Leonora Perez were charged with murder but convicted only for the charges of poisoning and conspiracy. Public opinion was against prosecution of the nurses on the basis that they could have had only the most trivial of possible motives for conspiring to commit such extremely serious crimes, and the case was dropped after a retrial had been ordered.