Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

Since I have no idea what the mechanics are supposed to be I'm not certain if this is a bug or "working as intended".

To try and see what the mechanics of toxicity were I had one of my erm... Merchandise Uplift and Lading Experts drink a series of elixirs I had lying around from my experiments.

1. Inivisibility
2. Greater Heroism
3. Greater Stoneskin
4. Spell Mantle
5. Greater Dispelling

For every one of them the message came up:

item toxicity: 0 + intoxication: 0 = total toxicity: 0

I would have thought they would have at least been revisiting their lunch by that point.
So... bug?

Conducted another test with a volunteer downing 4 elixirs of Spell Level 7 and Caster Level 24, still absolutely no toxic effect.
Can't really afford to conduct another... this stuff's expensive.