Well, there are MOST DEFINITELY images that are, UNAMBIGUOUSLY, VERY illegal. It is not hypocritical to say that detecting such images one a device means that someone should look into it, because something got VERY WRONG there.

So yes, MANY pictures already exist that do have more than enough information to determine that they are VERY ILLEGAL.

If you can't apprehend that, I don't know what to tell you.