IF the Stock Exchange is really serious about ensuring no one who has a criminal record can become a director of a listed company, then it may want to learn from the consulates.
Short of demanding a prospective director to present a Certificate of No Criminal Conviction issued by the police - a requirement imposed by the consulates on prospective emigrants - chances are some people will try to hide past convictions.
To ensure foreign convictions were also brought to its attention, the Stock Exchange would also need to call for similar certificates issued by law enforcement bodies of foreign countries where the prospective directors have lived.
Indeed, the revelation that Yu Pun-hoi was able to become chairman of the listed Ming Pao newspaper publishing group despite his criminal past shows how easy it is to hide one's history in Hong Kong.
Mr Yu said it was because of 'a genuine oversight and misunderstanding' that he failed to disclose to the Stock Exchange that he was jailed for cheque and credit card fraud and illegal possession of firearms in Canada in 1979.
It is up to the Stock Exchange to decide whether to accept Mr Yu's explanation and we make no suggestion that Mr Yu's failure to reveal his past convictions was deliberate.