51.   Doctors who treated survivors said cyanide gas, mustard gas and other nerve agents were used.

52.   He did not use an agent and negotiated the deal himself.

53.   He said he was approached by NBC management for an extension and signed the deal without using an agent.

54.   In a cost-cutting move, he has stopped using Secret Service agents to provide security for his routine movements around Washington.

55.   It would also become a federal crime to use biological agents in a way that shows reckless disregard for public safety.

56.   Known by its Portuguese acronym, PIDE, the International and State Defense Police used undercover agents and paid informants to intimidate dissidents into silence.

57.   Many people who are not happy with their so-called yellow teeth have opted to use bleaching agents.

58.   Naturopathy treats disease using natural agents such as air, water and sunshine and physical means such as manipulation and electrical treatments.

59.   NCAA colleges are prohibited from using agents to recruit players, and athletes could be ruled ineligible for entering into a verbal or written agreement for representation.

60.   Saddam again used chemical agents during a campaign to drive Kurdish guerrillas from their hideouts, killing thousands of Kurds.