Cam secret online
You may even have some "hidden" cameras of your own, like Dropcams for home security, nanny cams to watch the baby or a video doorbell to see who's knocking.
These cameras have plenty of perfectly legitimate uses.
"Assuming the camera has some form of lens, you use a device that has a very bright light source and a viewfinder that allows you to scan for the reflections from the lens," Professor Alan Woodward from the Center for Cyber Security at the UK's Surrey University, told CNN.
"If that were the case you could (assuming it's dark) turn off all the lights and use your forward-facing phone camera which tends not to have an IR filter fitted and so may see any IR illumination, assuming it's there.""If it does transmit RF, then you can again buy a standard bug detector that you sweep the room with to search for hidden sources of radio transmission," says Woodward.
Tech experts advise turning off all the lights and shining a flashlight around the area to search for a lens.
Two men have been arrested and another pair investigated in connection with the scandal, which involved 42 rooms in 30 accommodations in 10 cities around the country.
Police said there was no indication the businesses were complicit in the scheme.
Between November 2018 and this month, police said, the service brought in upward of ,000.
"There was a similar case in the past where illegal cameras were (secretly installed) and were consistently and secretly watched, but this is the first time the police caught where videos were broadcast live on the internet," police said.