To tell if one is under police surveillance, check for burglary with very little loss, disturbed or damaged ceiling tiles, disturbance of equipment or furniture, sudden availability of new items, such as clocks, power adapter or calculators. If an unknown vehicle follows one for longer than expected, stay alert to possible surveillance.
An individual can also tell that they are under surveillance if their private and confidential information is known to the public. Unusual activities, such as contractors' vehicles in restricted or private areas, can be another sign of surveillance. People who suspect they are being followed use the services of private investigators to confirm their fears. One important step that one should take in such situations is securing their private information.