Sneak Attack vs. DR

[Hypersmurf]

This states that a character has a chance of being poisoned if they take damage from an attack with a poisoned weapon. So clearly some types of DR (the kind that "instantly heal" the damage you do) will not negate poison.

Well, injury-type poison is called out specifically in the DR text:

Whenever damage reduction completely negates the damage from an attack, it also negates most special effects that accompany the attack, such as injury type poison, a monk’s stunning, and injury type disease.

As far as I can tell, the 'instantly heals' is flavour, rather than mechanics.

Let's say I have 3 hit points, and DR 15/magic of the 'instantly heals' variety. You hit me with a nonmagical axe for 14 points of damage.

Am I dead? Was I dead?

-Hyp.