The proficiency bonus simplifies all that down to one simple number. You'll automatically be proficient with a number of different weapons and armours based on your class and race. For skills, you'll need to choose which ones you want to be proficient in. Wearing armour you're not ...
Therefore, ricin is a prohibited substance both under the Chemical Weapons Convention (CWC, schedule 1 compound) and the Biological Weapons Convention (BWC) and its possession or purification is strictly regulated and controlled by the Organization for the Prohibition of Chemical Weapons (OPCW) [3]...