Elementary Angus Phrenology Head
What did Holmes do with the drugs Rhys gave him in the episode A Giant Gun, Filled with Drugs?
Watson damaged Angus by using the bust to incapacitate the rogue DEA undercover agent, I can’t help thinking that Sherlock concealed the drugs inside when he repaired it. After seeing the variety of weapons hidden around the brownstone I wouldn’t be surprised if Holmes, even as a recovering addict, has a small narcotics cache.
Maybe an accident will befall Angus, and Joan will discover the cocaine, her first drugs bust, if you will… ahem