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Hopefully we can get you sorted.
Could you give a little more information about how someone trying to take photos? What has made you think this is happening?
Do you have a Password set up on your Tab S2?
Have you installed any apps recently? There are a couple "fake" apps out there that don't do what they advertise.
If you go into Settings -> Apps -> Select the app you worried about -> Permissions -> and disable the camera permission
(only if you want to)
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