The character determine whether a creature, object, or area
has been poisoned or is poisonous. The character can determine
the exact type of poison with a successful Wisdom check (DC 20).
A character with the Alchemy skill may try an Alchemy check (DC
20) if the Wisdom check fails, or may try the Alchemy check prior
to the Wisdom check.
Note: The spell can penetrate barriers, but 1 foot of stone, 1
inch of common metal, a thin sheet of lead, or 3 feet of wood or
dirt blocks it.