Your iPhone camera can not only be used for taking pictures but also for detecting hidden cameras, GPS trackers, and listening devices in any room you want.
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Fortunately, hidden cameras in hotel rooms are extremely rare. But if you want to take precautions, a visual inspection and using detection tools can help identify any secret recording devices.
In most states, it's illegal to record hidden camera video in areas where your subjects have a reasonable expectation of privacy. In your home, these areas might include bathrooms and bedrooms (if your subject lives with you--as in the case of a live-in nanny).