What could possibly go wrong with this scenario?

[img_assist|nid=549|title=Cane Toad|desc=I'm in ur grass, poisonin ur wildlifes|link=none|align=right|width=250|height=198]

'Teacher toads' could be deployed as bioweaponsReleasing baby cane toads, which are poisonous but normally not fatal when eaten, could teach Australia's wildlife to avoid the deadly adults

[New Scientist - Latest Headlines]

For those too lazy to read the article, let me outline it thusly:

• In the 1930's, the Cane Toad was imported to Australia to combat the Sugar Cane Beetle, which was damaging sugar crops. It worked. Then the cane toads starting eating everything else, too. Oh, and while they look oh-so-delicious, they're also poisonous. To everything.
• One brainiac has an idea - let's release more of these little fuckers ahead of the hopping horde that's traversing the continent. That way, if native aussie animals try to eat the baby toads, instead of dying, they'll just get sick, and learn their lesson.
• Oh, and then there's this:
  

  For good measure, he says, the teacher toads could also be infected with a lung worm parasite that targets only the toads so that they won't start invading themselves.

  Because we know, by introducing something new, it's only going to solve the problem at hand... and not infect the entire south pacific with "lung worm parasite". Ick.