Identifying the Valentine’s Day murder weapon

Knife murder weapon

The air in the courtroom was so thick you could cut it with a…well…a knife, some broody dame was sobbing in the gallery, and the steno guy snuffled as he bashed the keys. It was a year ago today, Valentine’s Day, that the massacre took place. The investigating team was presenting its evidence, it was obvious to everyone but the judge, who’d stabbed the victim, the knife and the body had both been bagged. Trouble is, there was a thread hanging from the attorney’s Armani, but this was no slapdash haberdashery, this was the proverbial chink in the armour through which a guilty blade could easily slip. The wound was inflicted with the kind of blunt edged kitchen knife you can buy in any five and dime store so it was looking like our felon wasn’t gonna face the chair after all…

But wait, new evidence just in, a study of metal particles found in the valentines day wound reveals the presence of nickel and chromium atoms, exactly the same metallic blend on the accused’s kitchen dagger and in exactly the same ratio as the cutting edge of the knife itself. Crank up the juice Eugene, we got ourselves a fryer!

More cloak and dagger this week in David Bradley takes on Sam Spade, over on SpectroscopyNOW. You do know how to whistle, don’t you?

One thought on “Identifying the Valentine’s Day murder weapon”

  1. About the deduction of injury implements, many researchers have paid more attention to the micro-shape of wounds. However, micro-shape changes after several days after death. In contrast, metal particles in wounds were found in our daily examination by chance. We detected them in our preliminary experiment and thought they might provide another way to deduce the injury implement. However, the question still existed that the degree of accuracy was not ideal, because the quantity of particles was not so sufficient. Furthermore, the precision of EDX is lower than ICP-AES. So EDX could be only used to deduce the category of a metal injury implement. As such, a wound must be examined with ICP-AES. Our SEM/EDX and ICP-AES method is now gradually being accepted by the police as it can provide more stable evidence
    than other methods. it is essential to say that there is a long way to go to expand the technique more widely.

    We are selecting other implements to examine using this technique. We have found that blood
    clotting does not influence the result.

    All the best
    Rufeng Bai

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