I understand why this is but "if there's a will there's away" as they say. If someone wants to take explosive on a plane for terroist reasons they don't care about their own life so they will shove C4 in what ever body part they can.
They say a mother with a baby has to drink the baby milk to allow it on the plane? Have they not seen Jurassic Park of James Bond in which a 'illegal/dangerous/stolen' object is hidden within a everyday object but the key is for the object to briefly function as normal so not to cause suspiction. A C4 baby's bottle which briefly functions and is the realistic weight would pass right through?????