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UNCLASSIFIED/FOUO (U) Cellular Analysis Survey Team Policy Guide. 4.5.3. (U) Emergency Voluntary Disclosures (U) When there is a life-threatening emergency. b7E CAST assets seeking emergency voluntary disclosures must comply with DIOG subsection 18.6.8.5 for requests and disclosures under these circumstances 4.5.4. (U (U (See Dl subsection 18.6.8.4.2.6.3, b7E 4.5.5. (U) Cell Site Surveys. (U) A cell tower survey is a procedure to measure, map, and characterize the cellular RF environment in a geographic area, including cellular tower locations, associated RFs, and received signal strength. No court order is required for this purpose because the activity involves passive reception of unencrypted broadcast radio signals that are accessible to the general public which is authorized under 18 USC.$ 2511(2X(g). Members of the CAST must use commercially available cellular engineering equipment/devices to conduct cell tower surveys to prevent the unnecessary disclosure of law enforcement sensitive capabilities.. 4.5.6. (U) (U) b7E 4.6. (U) Cellular Analysis Survey Team Investigative Assistance. (U) CAST investigative assistance can be provided under the following circumstances: A. (U) In open predicated FBI investigations, including joint investigations with other. agencies. B.(U) When assisting other federal agencies (see DiOX() subsection 12.3.2) C. (U) When assisting state, Iocal, or tribal agencies in investigations that may involve federal crimes or threats to national security (see DlQ() subsection 12.3.2.3.A.). Such b7E assistance requires the opening of. 8 UNCLASSIFIED//FOUO