In order to poison someone, you need to be close enough to them that they're willing to eat/drink something you've prepared for them, which would suggest that t

In order to poison someone, you need to be close enough to them that they're willing to eat/drink something you've prepared for them, which would suggest that the majority of poisoning murders involve at least an acquaintanceship between the murderer and the victim. It seems very unlikely that 85%-99% of female serial killers (the required percentage to get to a 50/50 ratio) are all using undetectable poisons, successfully ordering these poisons in a way that can't be tracked, killing people they know with it, probably during a shared meal, then adequately disposing of the poison afterwards. Not to mention doing this over and over again without anyone getting suspicious about the fact that otherwise-healthy people around them are dropping like flies for no apparent reason. Do you have any evidence whatsoever for this?