Wikipedia has some useful information, <a href="http://en.wikipedia.org/wiki/Brown_tree_snake" rel="nofollow">http://en.wikipedia.org/wiki/Brown_tree_snake</a>. In the invasive species section notice that the islands where the snake is spreading to all have US military bases of some form - the snakes seem adept at hiding in the undercarriage of the planes. The snake has the potential to devastate a lot of unique ecosystems across the Pacific and if it ever gets to Hawaii there will be endless opportunities for it to spread far and wide.
So... when will we see Tylenol-resistant snakes emerge? If some of the snakes on the island are already resistant, they're just selecting for them with this air-drop.
If anyone is curious, as I was, apparently brown tree snakes are venomous (neurotoxin), but because of their rear-facing fangs in the back of their mouths, humans only get a trivial dose if bitten. So they're not considered dangerous to adults.