A federal grand jury yesterday indicted a Spingarn High School senior who federal agents say unwittingly supplied a prop for President Bush after the student was lured to Lafayette Square to make a drug sale. Keith Jackson, 18, a resident of Southeast Washington with no prior criminal record, was named in a five-count indictment. He was charged with four counts of distributing crack, including two alleged sales within 1,000 feet of Eastern High School, between April 24 and Sept. 1. The latter sale was the day that an undercover Drug Enforcement Administration agent arranged for Jackson to meet him in Lafayette Square across the street from the White House and allegedly paid the student $2,400 for three ounces of crack. The sale became the center of controversy last week when The Washington Post disclosed that the DEA had set up the deal so that Bush could hold up a bag of crack during a speech and say it had been seized "across the street from the White House" as a demonstration of how widespread the nation's drug problems were. When first contacted by the undercover agent in late August, Jackson appeared not to know what or where the White House was. Local law enforcement officials say there is no record of any other crack sales ever made in Lafayette Square. Although Jackson's name was not known until yesterday, President Bush vigorously defended the sale last week, saying, "The man went there and sold drugs in front of the White House, didn't he . . . . I can't feel sorry for this fellow." Jackson's court-appointed attorney, Alan Warner, said the alleged sale in Lafayette Square "definitely puts a twist on this case that you don't normally get." Warner said he did not want to speculate about Jackson's possible defenses. U.S. Magistrate Patrick Attridge ordered Jackson held without bond yesterday after a brief hearing in which DEA agent Sam Gaye testified about four separate crack sales by Jackson, including one on the "1600 block of Pennsylvania Avenue." Another hearing is scheduled for Friday. Warner said Jackson is a student in good standing at Spingarn and is not likely to flee and should be released on bond. The school in Northeast Washington was honored as being "drug free" at a White House ceremony in June. If convicted on the charges of selling crack near a school, Jackson faces minimum sentences of 10 years to life with no possibility of parole under new federal sentencing guidelines.