Three Dublin men are looking to be released from prison following last month's loophole that temporarily legalised drugs like ecstasy, crystal meth and ketamine.
The men were convicted with drugs offences under the 1977 Misuse of Drugs Act which was struck down as unconstitutional by the Court of Appeal.
Anthony Murphy of Galtymore Road, Drimnagh was jailed for 5 years for having over half a million euro worth of synthetic cannabis.
Keith Willis from Rossmore Avenue, Ballyfermot was caught with 5 thousand ecstasy tablets.
Joseph Carberry of Lonsdale Terrace, Ballymun was given an 11 year sentence for possessing pentedrone, described as a cocaine like synthetic drug.
All 3 men pleaded guilty but are now challenging the lawfulness of their detention.
Their lawyers say they are serving time for offences that didn't exist at the time of their convictions.
The loophole meant drugs like ecstasy and crystal meth were for a brief period legal before the Dail plugged the gap with emergency laws.
High Court President Nicholas Kearns will give a ruling later this month.
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