solarz
Brigadier
Since you're asking, I've seen many people with a hemorrhagic stroke. It can occur with those who are lot on blood thinners. And it's indistinguishable form those who do take blood thinners on CT scan. It can occur with vascular malformations and high blood pressure. People who take blood thinners don't walk around with bleeding all over the place. They look normal and may take longer to clot from a cut. No cuts or other skins breaks. No visible bleeding. So if someone is on blood thinners and they don't know it, their stroke would usually be chalked up to unknown htn or vascular aneurysm. Especially if they took advil or aspirin. The usual blood tests to check for blood thinning would be normal.
Anyhow My example was just a quick example so it's not great but the concept is there. I'm sure if one wanted to, one can make better poisons and make it look natural.
Anti-coagulant overdose is easily identifiable. You literally just need to realize that the patient's blood is coagulating at an abnormally slow rate. Don't you think they're going to notice that when they take the patient's blood work?