The Secretary may provide extraordinary protective services for foreign missions directly, by contract, or through State or local authority to the extent deemed necessary by the Secretary in carrying out this chapter, except that the Secretary may not provide under this section any protective services for which authority exists to provide such services under subsections (a)(7) and (d) of section 3056A of title 18.
The Secretary may provide funds to a State or local authority for protective services under this section only if the Secretary has determined that a threat of violence, or other circumstances, exists which requires extraordinary security measures which exceed those which local law enforcment  agencies can reasonably be expected to take.
Any agreement with a State or local authority for the provision of protective services under this section shall be for a period of not to exceed 90 days in any calendar year, but such agreements may be renewed after review by the Secretary.
Contracts may be entered into in carrying out this section only to such extent or in such amounts as are provided in advance in appropriation Acts.
Amounts used to carry out this section shall not be subject to section 4308(h) of this title.