Mick has been a health freak for years. I don’t think he’s done any drugs since the 70s.
Jagger had a "scared straight" moment as a young man following a notorious drug bust when the Stones were first climbing to fame in the mid 60s. Frightened of a long prison sentence (proper English lads of Jagger's upbringing don't go to prison), he's pretty much steered clear of drugs nearly his whole career.
Richards, on the other hand...