monitoring, surveilling, eavesdropping, reconnaissance, cameras, surveillance system, patrols, closed circuit, wiretap, interdiction, interrogations, vigilance, videotaping, radar, dragnet, security, fingerprinting, scanners, tracking, imaging, scanning, detection, inspections, manhunt, footage, bugging, enforcement, elint, snooping, plain clothes, supervision, law enforcement, counterterrorism, electronic warfare, spying, stakeout, video, suspect, facial recognition, awacs, quarantine, safeguards, plainclothes, screening, homeland security, airborne, arrest, oversight, sigint, voyeurism, lookouts, archerfish, detectors, observation, countermeasures, intercommunications, tagging, biometrics, patdown, identification, ultrasecret, sensors, sniffer, immix, informants, frisk, infrared, scrutiny, peeping tom, communications, sting operation, investigators, explosive detection system, dew line, detectives, profiling, mapping, police, comint, telephoto lens, uav, intercept, binoculars, randon, image intensifier, explosive trace detection, electronic surveillance, colposcope, searches, teleconferencing, firewalls, webcam, counterespionage, antitheft, counterintelligence, ripa, sonar, transmissions, breacher, eegs, photographic, aerial, inspection, regulation, auditing, consultations, espionage, intercommunication, policing, evaluation, recruitment, accountability, assessment, investigation, liaison, reexamination, support, containment, funding

vigil, watch

afisr, air force intelligence surveillance and reconnaissance, air force isr, darpa, defense advanced research projects agency, electronic surveillance, fisa, floodgate, follow, foot, foreign intelligence surveillance act, foreign intelligence surveillance court, intelligence cell, monitor, panopticon, ride herd on, shadowing, smokescreen, stakeout, supervise, surveil, survey, tailing, vigil, watch

investigating