With respect to masturbating at or near the scene, or spontaneously ejaculating while mutiliating, I think this is possible. Lacking any real forensics, trace amounts of semen easily could have been overlooked. To make the point, how could we possibly know if the Eddowes apron - smeared with blood and fecal matter - did not contain semen? There is no way of knowing for sure.
How long is semen detectable? Could its presence be detected on the letters?
How long is semen detectable? Could its presence be detected on the letters?
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