This probably varies quite a lot, but whenever I fail such tests[1], the first person they contact has always been the employer/school/team, not me. Usually, the business is discrete enough to privately reach out and allow me to explain myself. More than once, however, I would only find out about my failure and imminent expulsion after-the-fact via letter/email -- I've always been able to fight my way out of these situations, but often without my personal reputation intact.
[1]: Which I always do, as a person who has been prescribed Adderall since childhood[2]
[2]: Yes, the diagnosis is legitimate. It was diagnosed by a trusted family pediatrician during a regular check-up and was not solicited by my parents[3]
[3]: Yes, it is exhausting to explain myself, my parents, and my medical history like this whenever the topic comes up. Woe is me, woe is me, etc.
Dang! Your employer should not need to know about your medical history unless you're in a regulated position. Sorry to hear that it's an issue for you, and not every company handles it in a civilized way.
[1]: Which I always do, as a person who has been prescribed Adderall since childhood[2]
[2]: Yes, the diagnosis is legitimate. It was diagnosed by a trusted family pediatrician during a regular check-up and was not solicited by my parents[3]
[3]: Yes, it is exhausting to explain myself, my parents, and my medical history like this whenever the topic comes up. Woe is me, woe is me, etc.