first, where are u, hong kong or taiwan?
second, when did he open the acct?
third, where is he now? does he know he acct might be using by someone??
that's what i need now
p.s. different country has different rule on money laundry, i can't tell from your info u have above
"Money Laundering" or to be exact "Dealing with property known or believed to represent proceeds of an indictable offence" is in itself an indictable offence. Being an indictable offence, it is not subject to any time bar. In theory, Police can lay the charge against your brother some 20 years later, if there is sufficient evidence.
It is indeed a difficult subject. You should seek independent legal advice.