Knowledge: A hairdresser is a person who has completed the cosmetology program and passed all the tests. On the other hand, there is no sober test officially yet.

Conversation:
I have been sober for four months now and feel great.
Congratulations, so you have achieved independence from drinking alcohol correct?
Yup! Do you know a test I can do to prove it?

Response: Well no, there is no official sober test available yet.