61.   He added that the investigators had tried to control for such confounding effects.

62.   Government fraud investigators are trying to unravel a widening scheme in which phony medical bills using the names of unsuspecting patients and doctors are being submitted to private insurers.

63.   Haouari is at most a small figure in the terrorist world that investigators are trying to penetrate.

64.   He added that one of the great challenges today is research in neuroscience, where investigators are trying to understand how the human brain codes and stores information.

65.   He said investigators were trying to determine whether Wright was the officer Rubio is accusing.

66.   He said that investigators were still trying to find out.

67.   He said investigators are still trying to determine where the stolen chips were sold.

68.   He said investigators would try to determine if proper procedures had been followed, and who was responsible for any errors.

69.   He said that investigators were trying to determine if the two events were linked.

70.   He said investigators tried to snag him in that probe and others.