This can include observation from a distance by means of electronic equipment, such as closed-circuit television (CCTV), or interception of electronically transmitted information like Internet traffic. It can also include simple technical methods, such as human intelligence gathering and postal interception.

Technical Surveillance: This method involves the use of modern technological tools to gather intelligence and monitor suspects. It includes the use of CCTV cameras, audio recording devices, GPS tracking devices, body worn cameras, etc.

Surveillance means observing a person or area to gain information. Surveillance can be done to investigate a suspicious person or monitor an area for unwanted activity.