Two San Francisco Chronicle reporters have been subpoenaed by the Justice Department to appear before a San Francisco grand jury and identify the sources who supplied them with grand jury testimony in the BALCO steroids investigation Their stories on the doping scandal, published in 2004, helped lead to congressional hearings on steroid use in baseball, major league baseball rewriting its drug testing policy and raised awareness across the country about the danger and abuse of steroids among young athletes, including those in college and high school.