The Administrator shall establish such security requirements and safeguards, including restrictions with respect to access to information and property as the Administrator considers necessary.

No employee of the Federal Emergency Management Agency shall be permitted to have access to information or property with respect to which access restrictions have been established under this section, until it shall have been determined that no information is contained in the files of the Federal Bureau of Investigation or any other investigative agency of the Government indicating that such employee is of questionable loyalty or reliability for security purposes, or if any such information is so disclosed, until the Federal Bureau of Investigation shall have conducted a full field investigation concerning such person and a report thereon shall have been evaluated in writing by the Administrator.