Keep in mind any DNA, etc. of the boyfriend on the girlfriend means little, assuming they are intimate.
If he was actually knocked unconscious, medical evidence would be consistent with that, his actual external injury and his brain injury, reflexes, etc., and any detective hearing that story would check the results of his exam and treatment. He was concussed, and it's pretty hard to knock yourself out. Take a look at diagnosis of concussion and the sort of medical evidence typically found following being knocked unconscious.
You're not all that wrong. Just consider the knocked unconscious issue. And more important than her being cleaned up is cleaning up the floor. There was a lot of blood coming real fast. It's tough to mess around the body cleaning up like that without having to then clean up the floor on the way out to hide your own tracks and marks and those made moving the bodies.
And you might consider what the police find out about their relationship. Would he rape her? It's when things just don't look right that you do some deep thinking and close examination of the physical scene. And keep in mind that the skin under the fingernails won't be identified for a while, days to weeks, and the serologist won't tell the officers how it got there, just that it was there. Of course, that might give you some time to let the case against him build up to an open accusation.
In the deal as you describe it, there probably won't be much jumping to conclusions or acting too quickly. He's got a story, and the best way in for the investigators is to try to see if anything backs him up, like a neighbor seeing something or his established movements prior to the crime. If they can't make anything of that, they might start bearing down a bit on him.
May 07, 2008 Rating
A Very Useful Book For Crime Writers by: David
Hi Larry
You might want to get hold of the following book.
Forensics and Fiction: Clever, Intriguing, and Downright Odd Questions from Crime Writers by D.P Lyle
Book Description
How long can someone survive in a cold, damp cave without food or water? How was diphtheria treated in 1886? Can Botox kill? Can DNA be found on a knife years later? How are mummified corpses identified? How long does it take blood to clot when spilled on a tile floor? What happens in death from electrocution?
As a consultant to many novelists around the world and to the writers of such popular TV shows as Monk, Law & Order, House, and CSI: Miami, D. P. Lyle, M.D., has answered many cool, clever, and oddball questions over the years. Forensics and Fiction: Clever, Intriguing, and Downright Odd Questions from Crime Writers is a collection of the best of these questions. The answers are provided in a concise and entertaining fashion that will keep you wide awake so you can read just one more.
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