This news really highlights the confirmation bias that was in full bloom throughout the "discourse" around the initial reports of Lee's murder (e.g. https://news.ycombinator.com/item?id=35448899 ). Everyone is so quick to jump on negative news about the rare violent crime in e.g. SF thanks to feelings about petty property crime that it's obviously impossible to have any kind of fact-based dialogue about policy. Worth…
They caught her because they found traces of fish tank algaecide in the pill bottles. She reused the same mortar and pestle to do both. The local fish supply store had records of her buying the same algaecide.