How to detect whether the car is bugged?

Method 1: In nonmetallic environments (such as houses and human bodies), it can be detected by metal detectors, but some monitors and locators have little or no metal parts, and the metal detectors can't detect them, so this method has limitations. Method 2: Using the radio signal detector, we can detect the communication signals of Bluetooth, WiFi and mobile phones, and the monitor and locator will also send out such signals when they work, so that we can detect them. Specific methods: firstly, electromagnetic shielding is performed on the tested environment, so that all the known devices in the environment can keep electromagnetic silence or exit directly; Then, ask someone to speak loudly in all places in the environment; The monitor starts to work after detecting human voice, and the "monitored" human voice is converted into a radio signal and sent to the monitor. At this time, the signal detection equipment can detect the signal and then locate the signal to find the monitor.