DNA database

If the Metropolitan Police, as reported, investigate some MPs for alleged expenses fraud, will those MPs have DNA samples taken? If so, will those samples be stored on the DNA database, even if they're acquitted, or even not charged, as happens to everyone else?

Or will a busy Parliament find time to change the rules?

Or, will it be a case of rules applying to everyone except Members of Parliament?

Your guess is as good as anyone's.