''We'll be stricter enforcing the laws,'' N.H.L. Commissioner Gary Bettman said in a conference call announcing Campbell's appointment to replace Brian Burke, who left the job after five years to become general manager of the Vancouver Canucks. ... Asked how he would look at incidents brought before him for review, Campbell said that injury would be a major factor in his decisions. ''Injury or attempting to injure is a big part of discipline,'' he said. ''An infraction away from the play is also something to look into.'' Bettman has said that he expects the league to hand out longer suspensions to players who deliver blows to opponents' heads. The New York Times reporting on the hiring of Colin Campbell as the NHL's chief disciplinarian on July 21, 1998. Reports are swirling that Campbell will now step down from that position with Brendan Shanahan taking over.