We understand the difference between venomous and poisonous and if the OP did not already, which I'm pretty sure they did (they were just referring to the way the cops said it, at least, that's how I read it) then they do now. No need to harp on it.
Back on subject, it is terrible how some things that are misunderstood are treated with such disrespect and abuse. It's a shame for the animals and only puts them in a bad light surrounded by stupid people.