Poison=venomous
Or, if you are using injested poison use the rules for narcotic saliva. Do a consequenctial test based on deceit or craftsmanship or scholarship (depending on what skill you think is appropriate)
Taser can be done a few ways.
Make it weapon 3. Allow them to replace the weapon damage with a maneuver of the same strength as the weapon value (which is suggested in the book)
It probably makes more sense to make it weapon 2 or 1 and let them do regular maneuvers like shocked, stunned, electrocuted, zapped
And then tag those aspects for a take out.