Rikkitic:
froob: Crimes Act, s 200, Poisoning with intent
Crimes Act, s 202, Setting traps, etc
This makes it perfectly clear. Note there is no exception just because the trap is in your home.
Exactly There is no doubt its illegal. It be up to the prosecution to prove the intent, carelessness and find a chain of evidence beyond reasonable doubt I guess. If someone did such a thing.