Between 10 January and 30 November 2006, 698,649 subject profiles were loaded on the National DNA Database (NDNAD). It is estimated that this number of profiles relates to 621,798 individuals. (Some individuals have more than one profile on the NDNAD due to replicate sampling. For example, an individual arrested on more than one occasion may have a sample taken more than once because they have given a false name). At 30 November 2006, there were 4,280,379 subject profiles on the NDNAD which relate to an estimated 3,809,537 individuals.