Worth taking a look at this report about the National DNA Database in the Register:
It would have been more accurate for the NDNAD to say in its report today that between 1995 and 2005 approximately it tried to load 126,200 erroneous records onto the database, of which only 26,200 were stopped by the system.
…a further 10 per cent of records on the DNA database, which contains about 4.1m records, are duplicates. These are records that have identical DNA samples as other records on the database, but different identifying information.