21.   Allegations have surfaced that KGB agents used ricin in a botched assassination attempt against Soviet dissident Alexander Solzhenitsyn.

22.   But federal law enforcement agents used immigration charges to hold a half-dozen people believed to have connections to the case, according to law enforcement officials.

23.   But Ms. Gallagher said the immigration agents were using the law to bully and abuse those who cannot defend themselves.

24.   But Pentagon officials hinted broadly that the CIA may not have revealed all of the indicators its agents used to launch the strike.

25.   Criminologists and forensic bomb experts say the Unabomber eludes the FBI even though agents are using the best technology in their crime-fighting arsenal.

26.   During their searches of the woods during the past week, agents have used helicopters armed with heat-detecting sensors as well as a pair of bloodhounds.

27.   FBI agents later used the house as an observation post and sniper position.

28.   Federal agents used a battering ram to force open the door.

29.   For example, agents could use deadly force if they believed a fleeing suspect had committed a felony involving serious physical injury or death.

30.   For six years FBI officials and Reno had denied that agents had used such devices.