I don't really think it's a joking matter because Japan treats drugs very differently than, say, America. For example, when one of the Mach25 boys was caught for drug possession, the Ayu Ready? (Ayumi's tv show) site took down the page regarding Mach25's appearance on the show immediately. It was treated more like, "We'll pretend the problem isn't there."

Furthermore, Ayumi donated a lot of money to Thailand for the anti-drug program. These guys won't be dancing with her anytime soon, that's for sure.