; conversion, modification, and extension of federally owned buildings; preliminary planning and design of projects; and operation and maintenance of secure work environment facilities and secure networking capabilities; $30,000,000, to remain available until expended: Provided , That such amount shall be used for a second DNA laboratory: Provided further , That, notwithstanding any other provision of law, unobligated balances from prior year appropriations made available under Federal Bureau of Investigation, Construction, for a new headquarters, may only be used to sustain use of the Federal Bureau of Investigation J. Edgar Hoover headquarters building. Drug enforcement administration SALARIES AND EXPENSES (INCLUDING TRANSFER OF FUNDS) For necessary expenses of the Drug Enforcement Administration, including not to exceed $70,000 to meet unforeseen emergencies of a confidential character pursuant to section 530C of title 28, United States Code