Also, why the fixation on the toxicity level of the plant? It's a freaking plant that people obviously put outside in their yards where kids/dogs can accidentally eat it. My dogs have been poisoned by accident by eating a plant before, it happens. Obviously Walt did it but don't play stupid like Walt has no moral compass where he now can kill anyone even kids. No, if that was possible why would he go back home for 25,000 dollars to pay Saul's secretary to tell him where he is? Why doesn't he just 'force it' out of her? Exactly, just give it up, sheesh.