Documents collected by HSE since 1984 under the Asbestos Licensing Regulations are retained in accordance with HSE's retention policy. Archive paper files are reviewed for further retention after nine years and electronic files after seven years. If at that stage a judgment is made that the material should be retained the next review would be after 25 years. At 25 years it could be destroyed, archived, or kept for a further agreed period of time for operational reasons. Paper documents whose contents have been saved electronically may not be retained. Files of documents identified as relating to health, including asbestos health related files, are retained for 40 years.