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There is a Legacy version here.

PFS StandardImproved Poison Weapon Feat 8

Rogue 
Source Player Core pg. 173 2.0
Archetypes Assassin*, Assassin*, Poisoner*, Poisoner*
Prerequisites Poison Weapon
* This archetype offers Improved Poison Weapon at a different level than displayed here.

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.

Improved Poison Weapon Leads To...

Deadly Poison Weapon