With the effective definition and accurate depiction in movies and spy cops television serials, many people are now well aware of what the investigators do and why they are hired instead of letting the cases be handled by the police department.
Private investigation services are given a clear structure by the model portrayed in the serials and also the book novels. It is considered to be the part of the investigator's job to detect the wrong actions or sometimes even fix them up if required by the client and he/she can do it. Investigation services include the interviews from the people who were alongside the crime location to get the necessary information which can be proved fruitful for the client.
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Procedures adopted by the detectives and agents include the proper listening to the description provided by the client to understand the actual problem and to figure out the basic assumptions for the problem by thinking technically. They most of the time keep their identity hidden and never disclose it due to various different reasons either to protect their identity or that of the client.
Proper documentation is maintained so that the process becomes organized and streamlined. The searches on the suspicious location, on the crime scene and adjoining locations where some clue could be found are made by the trained investigator so that nothing remains unanalysed.