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There is a Legacy version here.

PFS StandardImproved Poison Weapon Feat 10*

Rogue 
Source Player Core pg. 173 2.0
Archetypes Assassin, Poisoner
Prerequisites Poison Weapon
* This version of the Improved Poison Weapon feat is intended for use with an Archetype and has a different level for access than the original feat.

You deliver poisons in ways that maximize their harmful effects. When you apply a simple poison with Poison Weapon, the poison deals 2d4 poison damage instead of 1d4 poison damage. You don’t waste a poison you apply with Poison Weapon on a critically failed attack roll.

Archetype Use

This feat can be used for one or more Archetypes in addition to the listed Classes. When selected this way, the feat is not considered to have its class traits.