From the Rodney King beating in 1991 through the O.J. Simpson trial, the rift has persisted and perhaps even widened - a nagging reminder of the challenge America still faces on race. The reasons for the gap are complex and deep. Experts say it's based in part on the nation's painful racial history, the well publicized incidents of excessive use of force against black suspects like Mr. Louima, and the current practice of so-called racial profiling, where skin color has become for some police a criterion to pull over a driver. Minorities sardonically call the offense DWB driving while black.” Racial profiling lies behind much of the distrust. DWB has been a well known phenomenon in the black community for many years, but it's been largely invisible in the white community until recently. Incidents like the admission this spring by the New Jersey attorney general that state troopers routinely engaged in the practice, after denying it for more than five years, have sparked a national reassessment of police practices on