The Department of Temporal Affairs was an agency within the United Federation of Planets. The introduction of the ablative armor system and transphasic torpedos to the USS Voyager by Admiral Kathryn Janeway of a future timeline were deemed as contaminants to the timestream by this department in the late 24th century. (VOY novel: Full Circle)

Its not known what relationship this department has with the Federation Department of Temporal Investigations.

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