The document discusses suspicious activity reporting and adversarial surveillance. It defines suspicious activity as behavior reasonably indicative of preoperational planning related to terrorism or other criminal activity. Prior to attacks, terrorists often engage in precursor activities like planning, acquiring materials, and reconnaissance. This adversarial surveillance is meant to gather information on locations, security procedures, and personnel. Citizens should report any suspicious surveillance activities to local authorities. Reports are reviewed by fusion centers and possibly shared with the FBI if deemed relevant to national security.