Quoting from the official playbook, Poisoner says:
You’ve mastered the care and use of a poison. Choose a poison from the list below; that poison is no longer dangerous for you to use. You also start with three uses of the poison you choose. Whenever you have time to gather materials and a safe place to brew you can make three uses of the poison you choose for free. Note that some poisons are applied, meaning you have to carefully apply it to the target or something they eat or drink. Touch poisons just need to touch the target, they can even be used on the blade of a weapon.
I understand that you can use and craft without any risks one poison of your choice, the one you've mastered. However the description says: ...you can make three uses of the poison you choose... which leads to confusion. Does this really mean the poison you chose/the poison you've chosen?
Would this mean you won't be able to craft any other poison but the one you chose?
Or is perhaps Poison Master allowing you to master new poisons, making them no longer dangerous to use AND ALSO craftable?