Application of special knowledge when conducting observation of a person, thing, place in criminal proceedings

The article, based on the study of current legislation, defines the main features of the application of special knowledge during surveillance of a person, thing or place. It was established that visual observation of a person, thing or place occupies an important place in the system of covert means used by operative units. It was found out that the specifics of its application and combination with other operational-investigative measures or covert investigative (search) actions depend on a specific operational-tactical or investigative situation. 
Emphasis is placed on the fact that the use of special knowledge in pre-trial investigation helps the investigator to orientate himself in complex specific issues during secret investigative (search) actions. It is noted that persons who possess this knowledge under the guidance of an investigator are able to identify significant violations and material traces of a criminal offense, which can be of great importance in the materials of criminal proceedings. The authors came to the conclusion that the application of special knowledge in conducting surveillance of a person, thing or place in the investigation of criminal offenses is very important. 
It is noted that in order to ensure the possibility of involving interpreters (sign language interpreters) in the surveillance of a person, thing or place and, if necessary, in conducting other secret investigative (search) actions, it is necessary to make additions to Part 1 of Art. 68 of the Criminal Procedure Code of Ukraine. 
The authors found that one of the purposes of monitoring a person, thing or place, defined by current legislation, is to obtain information about the behavior of the person being monitored. The starting material for obtaining such information is the interpretation of individual behavioral acts of an individual, their mutual relations, and even behavioral acts of persons with whom the object of observation is in contact. To ensure the fulfillment of the assigned tasks, the person carrying out this action must have special psychological training. In its absence, there is a possible risk of receiving erroneous information about the behavior of the object of observation.