As best I can tell, this feat is not working. I see no difference in a save against the poison spell with or without the feat.
It is also unclear what races are allowed to take this feat (in my testing, humans and elves no; orcs yes, but it would be hard to nail all possibilities down by trial an error) and whether those are the right races and/or if race is the right basis for restriction at all (as opposed to hometown). This might entail an enhancement request to have SHOWFEAT list race restrictions.
Poison Resist Feat
Re: Poison Resist Feat
AFAIR the feat applies only to normal poisons and not the spell. I don't have the rulebook on hand right now, but I could try to check it out.