This was all arranged!

Leo Crow's apartment has photos of children strewn about all over the bed haphazardly, where anyone can see them. Witwer points out how ridiculous it is that Crow would just have left incriminating evidence out in the open for no apparent reason at the same time John arrived, providing the perfect excuse for murder. It's so convenient that he immediately declares the whole thing staged, since he never saw anything like it when he worked as a homicide detective.

Example of:
Orgy of Evidence