The number of gun dealer requests for customer background checks through the National Instant Background Check (NICS) system rose 49% during the week before he was elected in 2008 compared with the same week one year earlier.
One dealer who has done a number of transactions with the family recounts a time when David's London nephew changed the price of a painting after the two had agreed on a number.
When they began to knock on doors and ask people about their concerns, though, coppers were astonished to find residents who did things like note down the registration number of every car visiting a drug dealer.