How a Killing Roused Irish Conscience
June 26 murder of Veronica Guerin, reporter for Ireland's Sunday Independent, forces Government to pass a series of laws giving law enforcement agencies the ability to deal with the newly sophisticated enemy she was writing about: organized crime; Irish police, who have heretofore been more restricted than officers in other Western countries, feel certain they know the identities of the men responsible for killing Guerin, but need to build an impregnable case before exercising their new, one-time right to detain them for questioning; Paul Ward has been charged with conspiracy to commit murder for allegedly having harbored the killers after the crime; photos of Guerin, her family and John Gilligan, who believes he is prime suspect (L)

