proviso shall be treated as a reprogramming under section 505 of this Act and shall not be available for obligation or expenditure except in compliance with the procedures set forth in that section. Interagency law enforcement Interagency crime and drug enforcement For necessary expenses for the identification, investigation, and prosecution of individuals associated with the most significant drug trafficking organizations, transnational organized crime, and money laundering organizations not otherwise provided for, to include inter-governmental agreements with State and local law enforcement agencies engaged in the investigation and prosecution of individuals involved in transnational organized crime and drug trafficking, $517,000,000, of which $50,000,000 shall remain available until expended: Provided , That any amounts obligated from appropriations under this heading may be used under authorities available to the organizations reimbursed from this appropriation. Federal bureau of investigation Salaries and expenses For necessary expenses of the Federal Bureau of Investigation for detection, investigation, and prosecution of crimes against the United States, $8,832,201,000, of which not to exceed $216,900,000 shall remain available until expended: Provided , That not to exceed $184,500 shall be available for official reception and representation expenses. construction For necessary expenses, to include the cost of equipment, furniture, and information technology requirements, related to construction or acquisition of buildings, facilities and sites by purchase, or as otherwise authorized by law