CCTVs

CCTV's have proved to be a blessing in these times. China used the CCTV technology coupled with Smart imaging technology to determine the whereabouts of the person, where had he been, or where he is progressing, etc to know if he had been in virus hotspot zone.

Even in India there have been instances of CCTV footages coming in handy to identify suspects South Korea and Singapore, too, have used CCTVs extensively in contact-tracing. The best example to prove this is how the local administration tracked down 900 people who had come in contact with an Italy return family, in Kerala. South Korea and Singapore, too, have used CCTVs extensively in contact-tracing.