If the facts turn out to be as reported in the Volkische Beobachter, then there is absolutely no excuse for this appalling event.
None.
Nada.
Zip.
Taking illegal drugs might perhaps appeal to certain ageing hippy champagne socialist lawyers, but it has no place in the UK Armed Forces. Whether chummy was an ACM or LAC makes no difference - the drugs policy is the same for all.
Re. the CDT, when they first bowled up at Brize to do their thing, a certain 'Kelvin Rucksack' was amongst the people they'd chosen at random. To which a Sqn Cdr remarked "Doesn't surprise me - everyone else has been taking the p*ss out of him for years!".