I know someone who works in the airport. Every time they pass the rampee's break station, they see literally hundreds of little bottles of shampoo that "fell" out of the bags.
My friend frequently does the Sgt Schulz "I see NNNOTHING!!" routine.
Good grief!
All they have to do is put a camera on the baggage handling and checked luggage inspection area. Film it and/or have someone watching the video.