It's good to know that our dedicated air controllers always follow the rules regarding impairment.
10% rule. 10% of any group of similar people, such as controllers, pilots, doctors, lawyers, IT nerds, etc., will cause 90% of the problems. My industry and my airline have plenty of instances where a pilot or flight attendant showed up to work drunk or high. Stupid people do stupid things regardless of their education level or success in life.