First Sniper Trial Heartens Defense for the Second
Lawyers for Lee Malvo, younger suspect in Washington-area sniper shootings, are pleased with trial of first defendant, John Muhammad, because Virginia prosecutors are depicting Muhammad as mastermind of killing team in which Malvo, 18, played distinctly subordinate role; Malvo defense plans novel argument that indoctrination by older man was intense as to result in form of insanity; Michael S Arif says he is not troubled by proximity of Muhammad trial, although Fairfax County prosecutor James F Horan Jr sess problems in selecting Malvo jury; Arif photo (M)

