Magazines are designed to be light-tight in and of themselves. However, usually this is buffered by additional precautions made to maintain light-tightness, against both fault of equipment and humans. The latches used to open the magazine usually lock when closed and require non-casual fiddling to trip their locks. They are then furthermore protected by being taped up when loaded. Sometimes the entire edge of the magazine door is taped as an extra measure of light-tightness, although for newer properly maintained magazines this is not strictly necessary.