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A lot of spy cameras have an IR light that will be visible if viewed through your phone camera, so turning out the lights and doing a quick phone camera sweep can help.

I'm guessing this won't apply to all cameras though.

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Phone cameras typically have IR filters that filter out that light. You need to modify the camera (or have an exceptionally cheap one?) to not have it filtered.

It used to be that the front/selfie camera would not have a filter.

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