e-sherlockholmes
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I notice that the power saw he bought has a laser guideline for accuracy, and also a dust extractor.
I'm thinking it wouldn't spew "stuff" everywhere, these modern tools don't. and if a bag was fitted to the dust extractor
that would collect the mess.
There is no easy way to say these things.
I honestly doubt the suspects used the circular saw much. They may have purchased it. They might have tried, and then my theory is they realized it was unworkable and just resumed using knives.
Anyone who's done wood working knows circular saws are loud. You need hearing protection when using it safely. Again, lends to the suggestion that neighbors and most certainly the "innocent" female suspect should have heard it when used. The obnoxious loudness is actually a desirable side effect of these saws, because it alerts bystanders a construction power tool is being used, as is the byproduct of the motor being loud due to the cooling fans used to cool the motor.
There is also so much raw power with these things. You need two hands to hold it otherwise there can be serious kickback. The centrifugal force and tangential velocity developed in the spinning blade will also throw things everywhere (in this case tissue and bone).
Those saw blades are also designed for cutting wood, not tissue/bone. The closest it is good for cutting is maybe cutting the bone. But even then, it will have serious kickback if not feeding the cut into the hard bone slowly (like cutting some hardwoods).
Not to mention, these circular saws have a blade guard that is designed for assisting with cutting wooden boards. They spring load back to cover most of the blade as a safety measure. You can hold the blade guard back, but that involves experience with the tools. Is the suspect totally green with home improvement?
There is also a shoe for the circular saw that will impede working around random rough terrain of a body, since the circular saw is designed to rest on flat surfaces using the shoe. Also, the maximum depth of cut of even standard variety 7-1/4" diameter blades is only good for around 3" maximum depth of cut. The body is a lot larger than 3" depth of cut. You can cut around on both sides, allowing 6" diameter cuts. Tissue is squishy so you can probably compress onto it to cut deeper, but I would imagine a circular saw has serious problems cutting the thigh, for example. Its just not designed for the purpose.
If someone is familiar with the autopsy details, which parts of the body actually involved a severed bone? That is probably the only cases where the circular saw is used.