Related by context. Frequent words. (Click for all words.) 38 surveillance 30 video 30 surveillance cameras 29 cameras 29 CCTV cameras 29 CCTV 29 Surveillance 28 security 26 imaging 24 Cameras 24 detection 22 scanning 22 Security 22 camera 21 monitoring 21 monitor 20 scanners 20 situational awareness 19 facial recognition 19 intrusion detection 19 footage 18 scanner 18 radars 18 biometrics 17 countermeasures 17 wiretapping 16 eavesdrop 16 CCTV footage 16 vigilance 16 detain 16 tracking 15 body scanners 15 homeland security 15 GPS tracking 15 safeguards 15 interdiction 14 detectors 14 plain clothes 14 wiretaps 14 wiretap 14 thermal imaging 14 eavesdropping 14 unmanned aerial vehicles 14 apprehend 14 sensors 13 unmanned 13 dragnet 13 arrest 13 monitored 13 satellite imagery 13 remote sensing 12 audio recordings 12 surveillance tapes 12 radar 12 fingerprinting 12 screening 11 reconnaissance 11 spy satellites 11 videotape 11 electronic warfare 11 plainclothes 11 videotaped 10 unmanned aircraft 10 covert 9 patrolling 9 spying 9 snoop 9 counter terrorism 9 X ray machines 9 Foreign Intelligence Surveillance 8 patrols 8 inspection 8 oversight 8 videotaping 8 enforcement 8 massive manhunt 7 airborne 7 voyeurism 7 supervision 7 manhunt 7 quarantine 7 night vision goggles 7 interrogations 7 suspects 6 interrogating 6 patrol 6 interrogation 6 law enforcement 6 suspect 6 videotapes 5 antiterrorism 5 spy 5 undercover 5 snooping 4 bugging 3 surreptitiously 3 counterterrorism 3 inspections 2 FBI agents 1 FBI 0 lookouts