A senior Met police detective is due to be sentenced today, after being convicted of trying to sell information to the News of the World about the phone-hacking inquiry.
April Casburn, who was found guilty of misconduct in public office in January, was told by the judge that she could face a custodial sentence.
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A former health and safety chief said building regulations are confusing and the profession suffers from competence issues.
The tiny card, which is 15 microns by 20 microns, even includes an intricate inscription of a snowman and seasonal messages.
Police say they have traced four drivers who are thought to have hit the woman, and added that a fifth vehicle may also have been involved.