[Neidermeyer]

So, not a good choice for a conspiracy-type killing.
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I disagree , arsenic is easy to source and fatal .. if you’re going to kill someone and it’s likely there will be an autopsy why bother trying to hide it...

The other 2 poisons that are easy to source would be Nicotine and Ricin ..

[null and void]

Especially if you want to be in-your-face about it.