Physical surveillance and observation

18:58 Mar 14, 2023 

In short, observation is noticing or perceiving of an act, instance or detail. This is a passive action. While Surveillance is keeping watch over someone or something and is an active measure.
Скры́тое наблюде́ние (нару́жное наблюде́ние, сленг. — сле́жка, нару́жка, хвост) Physical surveillance
визуальное наблюдение за лицом (заметить, осознание, восприятие) - observation

12:51 Mar 14, 2023 

Коллеги, а вам не кажется, что слово "физический" здесь, как и в большинстве других случаев, является ложным другом переводника?

08:23 Mar 14, 2023 

https://www.mylawquestions.com/what-is-physical-surveillance...
What is Physical Surveillance?

Last Modified Date: February 23, 2023
Physical surveillance is a form of monitoring where the subject is kept under physical observation. It can be combined with other modes of surveillance for complete coverage and may be used by law enforcement officers, as well as private investigators. This type of surveillance requires special skills and is labor intensive, as personnel must be continually rotated to provide coverage, and it may be necessary to use an array of observers to avoid attracting attention from the subject under observation.