Man I really hope if/when extraterrestrials find us and inevitably decide to attempt to enslave and/or exterminate us all that they'll have a similarly low tolerance for sudden acute lead poisoning.

I mean, assuming they don't have near magical technology, upon inspecion from light years away they'd be seeing the planet as it was ages ago.

If they see us at all, they would be certainly not see us as we are now with all our fancy weapons and absurd amount of highly armed civillians; but as we were then, with something more akin to sticks and particularly sharp rocks.

They might be woefully under-prepared. No one brings nuclear weapons to put down a rabid squirrel, why would they send their finest defenses for a silly little planet that is still throwing stones?

Hell, I'm sure one dude in Texas could take on their entire armada just from the guns stashed in the kitchen.