Frankly, if the coke is Hunter's, that's the best option. Even if it's not the Biden admin should lie and say it is, because everyone else would be like "See, I knew it!'. But if the coke belonged to someone else, like a staffer or visitor, that outcome would be far, far worse, like massive lack of security or just the fact that a staffer is using cocaine. Obviously, it's Hunter's, but I think most Americans could easily accept that a long-time coke addict is still using cocaine, rather than a random person smuggling it into the White House.