The Supreme Court will give its judgment on the State's appeal against a legal challenge won by convicted murderer Graham Dwyer in Waterford next week.
Graham Dwyer was found guilty of the murder of Elaine O'Hara following a high-profile trial in 2015.
However, a high court ruling in 2018 found part of the legislation allowing mobile phone metadata to be retained and accessed in the investigation of serious crimes breached EU law and the European Convention on Human Rights.
The State believes the law should stand, and says the upholding of the High Court ruling could have adverse consequences for the investigation of serious crime going forward.
Seven judges of the Supreme Court spent several days listening to the appeal in December and are due to give their judgement when they sit in Waterford on Monday.
