pf2e.fyi
From Pathfinder Wake the Dead #4, which isn't enabled.

Undead Spotter

FEAT 1

Your studies of the undead have taught you telltale signs of a disguised undead creature. When you Pursue a Lead that involves a corpse or creature within your reach, you can touch that corpse or creature to immediately determine if it is undead. You also gain a +1 circumstance bonus to Recall Knowledge checks about undead creatures and to determine if a creature is undead.

Pathfinder Wake the Dead #4OGL