The desire to know the secrets of someone's actually very nature of man. Overheard someone else talking, despite on indecency of this occupation has always been very attractive. Warn action plans and find a competitor, possibly neutralize someone's intrigue by experienced people in this area. Often, under this set of measures is proposed:

- Inspection and detection eavesdropper devices and hidden cameras in the rooms before the charge of negotiations, meetings, meetings, etc.;
- Search eavesdropper devices that are in active mode, using the radio channel, a power, telephone network, security and fire alarm cables transit;
- Search eavesdropper devices that are in inactive mode and located in the walls, ceilings, engineering designs, interior;
- Search eavesdropper devices in ventilation systems, heating, insulation flaws that use space - stethoscopes. - checking of vehicles for the presence of eavesdropping devices.
It should be noted that this range of services performed by special companies that have a state license for such services.