add a zombification chem to the traitor poison bottle pool

[atomic1fire]

I'd say instead of including necrovirus with the poison bottles, having some sort of "Stolen bio-dome research" would make more sense canonically. A very distinct looking briefcase that contains vials which gives the more dangerous pathology symptoms, which could include zombie-ism. At least then you need to know what you're doing in order to release zombies, and you could probably even parlay it into roleplay where you threaten to release it if the crew doesn't give you cash.