How many arrows can I poison with 1 dose of poison? And where can I find this in the rules? This is for PFS if they have different rules.
One single arrow.
Applying poison to a weapon or single piece of ammunition is a standard action. Whenever a character applies or readies a poison for use there is a 5% chance that he exposes himself to the poison and must save against the poison as normal. This does not consume the dose of poison. Whenever a character attacks with a poisoned weapon, if the attack roll results in a natural 1, he exposes himself to the poison. This poison is consumed when the weapon strikes a creature or is touched by the wielder. Characters with the poison use class feature do not risk accidentally poisoning themselves.
There is nothing in the rules that says multiple arrows can be poisoned with a single dose, so they follow the same rules as all other weapons - one dose is enough for one weapon/arrow.
So I saw that and was thinking that it just took a really long time to apply poison to arrows, not that it was one and done for them too. So this means ranged attacks aren't any more efficient than weapon attacks. Well good to know.