Mate I don’t want to sound like a dick because maybe you don’t know this but I would say that between 30- 50 percent of the current NRL players have “resorted to” illicit substances off field.Sorting him out - getting in his dial , drilling him everytime he got the ball , closing down his options , mopping up his breaks : they're all skills. A decent lock forward would be shadowing his every move.
Munster thrives in the modern game because he does play a bit of adlib & there is no second line of defence. Once a break is made you only have the Fullback to contend with. Watch Munster in any game & you'll see him constantly offside , coralling the attack back toward the ruck & nothing is done. He's also not averse to questionnable tackling techniques which go unpenalised.
Yeah he's one of the better Players at present but a Bloke who resorts to illicit substances off-field I dare say would not think twice about enhancing his playing performance by whatever means. Melbourne have had these issues over time & we dare not mention the links between T. Robinson's Brother , Essendon & Danks. Good luck to B.Smith going to the Roosters - he should have a WOW of a time there (particularly on the Party scene).
Young people do drugs.
Young people with lots of money especially.
Cocaine is everywhere, Munster is not unique.