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![Kenku](http://cdn.paizo.com/image/avatar/KenkuMini.jpg)
Greetings, Shawn!
In order to best help you get the answer your question deserves, I've flagged your post to be moved over to the Rules Questions Forum. There is nothing PFS-specific about this particular item.
That being said, the answer lies in the item's description:
Poisoning Sheath wrote:
This scabbard contains strips of natural sea sponges on its interior. By carefully pouring a dose of poison into the empty scabbard (a full-round action), you saturate the sponges with the toxin, which keeps it viable and wet for up to 4 hours. Preparing the scabbard carries the normal risk of poisoning yourself, just like poisoning a weapon. The next weapon you draw from the scabbard is automatically poisoned as if you had directly applied poison to it (but does not risk poisoning you); this consumes the poison in the scabbard. A scabbard only fits one type of bladed weapon, such as a dagger, shortsword, or longsword. This kind of item is usually illegal in areas that outlaw poison.
It only mentions poisons, so you may only use poisons with it.