Scientists are hard at work...making mice poison resistant?

I'll give you a link to an article I read yesterday that still kind of baffles me. Research has went into gene mutation and scientists have now been able to make mice resistant to Warfarin, which is an anticoagulant (meaning it doesn't let blood thicken). It's a nice idea that could be applicable to humans, but I can see the dark side of this too. If that mouse gets out and mates, we could have tons of rats that won't die from the typical poisons we put out. This only means we'll need stronger ways of killing vermin. Does anyone remember how the Black Plague or Black Death, as some call it, got started? Rats, that's how. The rats carried fleas on merchant ships from Asia to Europe where it wiped out 30 - 60% of the population. So it's a good idea to make the carriers of disease resistant to normal methods of death. Cockroaches are dirty creatures and they can withstand extreme heats and radiation. Why not make the rats as tough as roaches, so we can bow down to our Rat Overlords in the coming years? I know that rats and mice are different, but they're in the same family and bowing down to a Mouse Overlord is something we already do every time we take our kids to Disney World...Rat Overlord sounds better anyway.

The article can be found here.