According to an article in The Guardian, poisoned bait was found on the Raeshaw Estate in the Moorfoot hills, near Peebles, in June 2009, during a police raid. The raid followed the discovery of a poisoned red kite on neighbouring land. Several injured dogs were found during the raid and were removed by the SSPCA, who suspected they had been used for badger baiting. Further information can be found here: http://www.guardian.co.uk/environment/2009/jun/15/police-raid-red-kite
In 2004, the bodies of nine raptors (5 barn owls, 2 buzzards, 1 kestrel & 1 tawny owl) were found dead on Raeshaw Estate (see here). Nobody was ever prosecuted.