Umm. The cocaine was found in a cubby hole accessible to literally anyone. Secret Service said the area where it was found doesn't have security cameras. Secret Service narrowed down the list of possible suspects, based on who was in the area during the time frame, but without video or physical evidence there's no way to confirm the identity of the individual.

snip
'White House cocaine was found near the Situation Room and NOT in the West Wing visitor entrance: Drug story changes for the SECOND time as Secret Service now says dime bag was found in a more 'secure' location'

dailymail.co.uk - White House cocaine near Situation Room

side note
snip
'MAUREEN CALLAHAN: Yeah, right - the White House can find Bin Laden lurking in a remote Pakistan compound' but not a cocaine culprit under its nose. How much longer will we let them take us for fools?
We are meant to believe that the United States Secret Service, tasked with protecting the very life of the president, cannot crack the case of who left cocaine in a secure, hard-to-access part of the White House ' despite facial recognition cameras, guest-book logs and security all over the most protected building in the Western world.'

'The cover-up, as the Nixon-era saying goes, is always worse than the crime.'

dailymail.co.uk - CALLAHAN White House Bin Laden Pakistan not cocaine culprit nose

And none of the Bidens (including Hunter) was in the White House at the time.

snip
'According to the Friday, June 30 pool report, Biden gave remarks in the Roosevelt Room that afternoon, and didn't depart the White House for Camp David until 6:34 p.m., along with First Lady Jill Biden, Hunter Biden, and Hunter's son Beau Biden.'

foxnews.com - Fox news press pool report contradicts claim biden family white house cocaine discovery

First, there's no reason to believe Hunter Biden is living in the White House.

There is no reason not to believe it as much as Hunter is at the White House and going with daddy to Camp David and the beach weekends.

Second, what "taxpayers dollars"? His meals? It's not like there's not an extra bedroom or two in the building.

Who is paying for Hunter's expenses while at long stays at the WH, Camp David, trips abroad etc.
And what about this expense?

'Secret Service paying over $30K per month for Malibu mansion to protect Hunter Biden'

abcnews.go.com - Secret service paying 30k month malibu mansion protect

Finally, Hunter Biden's addiction recovery shouldn't be of interest to anyone but his family and closest friends. Your obsession is just weird and, frankly, cruel.

It it were my next door neighbor's son, right, none of my business. If it is my President's son, yes it is my business same as you would make it your business if it were President Trump's son.