KiloB. Roger Moore's character Shawn Fynn had the right idea about dealing with drug peddlers in The Wild Geese.
The cocaine dealer was made to eat the bag of the filth he'd been selling - which had been laced with strychnine.
As for the pongos, I would wager that many Lt. The Honourable Rupert Hardly-Worthitt and his hoorah-Henry chums of some so-called smart cap badge outfit would probably have been involved at some party or other in the City with drugs widely available.
When recruiting for the UAS, we had to ask the 'Big 3', which included asking whether the candidate had ever been involved with drugs. Any hint of a 'yes' meant GET OUT! I hope that is still the case?