The man was arrested as part of an investigation into immigration irregularities.
A retired Garda, arrested as part of an investigation into immigration irregularities, has been released without charge.
The man in his 60s was arrested on Wednesday by gardai from the Roscommon/Longford division, and was being held in a midlands garda station.
The probe started in mid-2017 and focused on a Garda station in the then Western Region.
A file is being prepared for the Director of Public Prosecutions.
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