Uh oh——this is making me wonder if perhaps, being outdoors, he did in fact ejaculate, a bit removed from the girls, and covered it up sufficiently?
IMO there had to be a sexual component to this crime or they wouldn’t be unclothed, in whole or partially.
Still I remain grateful that at the least, he didn’t defile the girls’ actual bodies this way.
Not that that gives much solace, since of course they suffered and died in such a horrific fashion.
JMO and sorrowful speculation.
He could have ejaculated inside them while wearing a condom and left no trace.
All that can be said...
I agree with someone else's comment that even using a condom, they are often able to detect trace elements left behind by the condom's dry (unlubricated kind) or wet (lubricated kind) coating.
The forensic scientist is cataloging lubricants as a way to identify sexual predators
cen.acs.org
And also....I hate saying it, but I will.
We are talking about 13 and 14 year old girls who very likely had never been sexually active.
A grown man forcing himself on a young teen virgin is going to cause inflammation, abrasions, etc. that a ME would detect. IMOO, MOO, and all that stuff.
Ugh, now I need to go wash my brain.