NEW LAWS CURB TEEN SPORT DRUGS As Diet Supplements Gain Popularity, States Move to Regulate Use By Young Athletes OAKLAND, CALIF. - The days when performance-enhancing drugs were the stuff of East German Olympians and a few light-witted linebackers are over. On high school football fields from Nebraska to California, students are turning themselves into pad-clad rockets by taking pills that give them an abnormal surge of strength - and have been blamed for 80 deaths nationwide. Teenage linemen weighing 300 lbs., once unheard of, are now as common as helmets and cleats - a trend many attribute, in part,...