The investigation of crimes committed by law enforcement officers is carried out by a special service – the main Department of its own security. Their work is exactly the same as that of other "normal" police officers : data collection, operational development, surveillance, wiretapping, interviewing witnesses, initiating criminal cases... with only one difference - employees of their own security work against their colleagues. No one likes them , they are only afraid of them. They are a foreign element that has been openly introduced into the country's law enforcement system .