That's only legal with a doctor's note

from Justin Bieber (Ft. Chance The Rapper) – Confident Lyrics on Rap Genius

Meaning

In certain states in the USA, it’s only possible to get weed (legally) with a signed certificate from a doctor.

This yet another reference to Miley Cyrus who has video typed smoking weed and later said it was salvia because that drug was legal in the state she was in.

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