These ledge type toilets are often used in hospital Out patient departments. They facilitate the collector stool samples. Another place I first saw them in a non hospital environment was at a Centre Parks in Cambridgeshire.
This German examining thing what are they looking for and how are they trained to see it. The only thing I can think of is blood in there but its microscopic so you need a lab to find it - unless it looks like a chorizo, in which case you got big problems.
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