This is more commonly known as ‘debugging’. Many businesses have information that they see as proprietary and would not want this to be known by a competitor.
It may be as simple as having a boardroom, meeting room or office checked before it is used for an important meeting or just a simple check to ensure that long term ongoing electronic surveillance is not taking place.
We can complete a physical and electronic check at any time but it is usually after business hours to ensure there are no illicit listening or recording devices hidden away in your building.