Authorities say 27-year-old driver of a Mercedes that fatally plowed into a 30-year-old woman crossing Brighton Beach Avenue over the weekend was on drugs at the time of arrest. Police sources told the NY Post that Ronald Suriano "had just smoked a PCP-laced cigarette"; the Daily News' sources say he was "high on heroin." Suriano was traveling over the 30 MPH speed limit--the victim's friend said, "It had to have been over 100 mph." Apparently......