The paper deals with the possibilities of using the electronic control system by law enforcement agencies, both in connection with the control of the execution of house arrest and in connection with the control of obligations imposed in connection with the replacement of procedural custody. It draws attention to the fact that the intended purpose of the legislator, when adopting legislation enabling its use in the past, encountered practical problems in its actual implementation, on which law enforcement authorities cooperate with a private entity in terms of technical security.