The shadow is my hand holding the phone. Just to see what it would look like I took a quick snap of this document using my camera phone. It was so easy and fast that I could have easily acted like I was answering an unexpected phone call when I was doing it. Imagine a student during an exam saying, "Oh, it is my baby sitter!" The student may not even have a child, but without your knowledge the exam could have been photographed and pix mailed to a whole group of other people in the time it takes to say, "the cough medicine is in the medicine cabinet."