Soon afterward, Somerset began to notice Cullen's wrongdoing. The hospital's computer system showed that Cullen was accessing the records of patients to whom he was not assigned. Co-workers began seeing Cullen in the rooms of patients to whom he was not assigned. The hospital's computerized drug-dispensing cabinets showed that Cullen was requesting medications that his patients had not been prescribed. Cullen's drug requests were strange, and included many orders that were immediately canceled, and many repetitive requests within minutes of each other. In July 2003, the executive director of the New Jersey Poison Information and Education System warned Somerset officials that at least four suspicious overdoses indicated the possibility that an employee was killing patients. The hospital delayed contacting authorities until October. By then, Cullen had killed at least another five patients and attempted to kill a sixth.