Cash for Honours

Just thinking about Shir Sean, not that I'm suggesting anything improper in respect of himself, got me to thinking about the Cash for Honours problems which Bliar faced in his closing days.

Both Ruth Kelly and Lord Levy were questioned under caution and under the guidelines should have been required to give a sample of DNA for the database even if subsequently not charged with any offence.

Why won't the Met. confirm whether this happened? One rule for them etc.