Related by context. Frequent words. (Click for all words.) 43 camera 40 imaging 37 cameras 35 thermal imaging 33 surveillance 33 scanner 32 Cameras 31 GPS tracking 29 remote sensing 29 sensors 28 biometrics 28 video 27 scanners 27 monitoring 26 night vision goggles 26 scanning 25 surveillance cameras 25 tracking 25 detection 24 Surveillance 24 CCTV 23 facial recognition 23 monitor 23 wiretapping 23 reconnaissance 23 situational awareness 23 unmanned aerial vehicles 23 detectors 22 wiretap 22 CCTV cameras 21 electronic warfare 21 videotaping 21 eavesdropping 21 covert 21 wiretaps 20 intrusion detection 20 bugging 19 undercover 19 snoop 18 unmanned 18 body scanners 18 eavesdrop 18 surreptitiously 18 audio recordings 17 spy 17 enforcement 17 unmanned aircraft 17 spying 17 spy satellites 16 snooping 16 voyeurism 16 massive manhunt 16 videotape 15 FBI 15 satellite imagery 15 plain clothes 15 radar 15 lookouts 15 radars 15 monitored 15 manhunt 14 FBI agents 14 arrest 14 apprehend 14 airborne 14 plainclothes 14 Security 14 interrogations 13 law enforcement 13 security 13 counter terrorism 13 patrol 13 surveillance tapes 13 interrogation 12 videotaped 12 homeland security 12 inspection 12 countermeasures 11 fingerprinting 11 antiterrorism 11 CCTV footage 11 footage 10 interdiction 9 Foreign Intelligence Surveillance 9 patrolling 9 interrogating 9 videotapes 9 X ray machines 9 dragnet 9 detain 8 patrols 8 suspect 7 counterterrorism 7 safeguards 7 vigilance 6 inspections 6 supervision 6 suspects 5 screening 5 oversight 0 quarantine