Compliance Accelerator provides a deduplication feature. The purpose of this feature is to identify and remove duplicate items from the results of a search, and so prevent them from appearing in the review set. To determine whether one item is a duplicate of another, Compliance Accelerator compares the metadata properties of the items, such as their author display names, subjects, and number of attachments. Note that the deduplication works within individual searches only; it does not span multiple searches, even when you run them within the same department.

For all types of searches (immediate, scheduled, and guaranteed sample), Compliance Accelerator deduplicates the items as part of the sampling process. For guaranteed sample searches, Compliance Accelerator adds randomly-sampled items to the review set to compensate for any shortfall that the deduplication process has caused.