You could do something like key off image size/type, and have all your RAW format encrypted to a hidden volume while any of the JPEG settings saved to a normal

You could do something like key off image size/type, and have all your RAW format encrypted to a hidden volume while any of the JPEG settings saved to a normal volume. Then high quality, professional shots are hidden while the kind of photos you might take as a tourist are sitting there openly. It'd be detectable if you knew what to look for, but a) you likely can use more subtle activation techniqies (photo knocking?) and b) a lot of security checks aren't that sophisticated.