Homeowners should concentrate on being observant and trying to notice some of the signs that may indicate the presence of a listening device. If such clues are observed, the services of a professional are necessary. If phones, televisions, intercom systems or other electronic devices emit unusual sounds, exhibit volume fluctuations or pick up unexplained interference, they may be connected to a listening device.
While amateurs can purchase devices, such as line analyzers and radio frequency detectors, without the training to operate them correctly, they are unlikely to discover listening devices.
According to Wright State University, people who believe that they may have a listening device in their home or office should not attempt to find it themselves. In most cases, they are unable to find such listening devices. This causes them to believe they are safe, even though they are not. Instead, the best course of action is to hire security professionals to conduct a technical sweep of the area.
Professionals use a variety of techniques to find listening devices. In addition to performing a physical inspection of the entire area that may be bugged, professionals use radio frequency detectors to detect the transmissions that come from listening devices, line analyzers to check Internet and landline connections and infrared cameras to look for the heat signature of listening devices.