But it won't open the floodgates for everyone to appeal sentences.
A former midlands detective believes a successful appeal by Graham Dwyer may lead to a number of convictions for serious crimes to be appealed.
The high court has ruled that the communications retention of data act could be in breach of EU law and human rights legislation.
It's referred parts of the act to the European courts to get clarification as to whether An Garda Síochána implemented the law legally.
Author of Making a Detective, private investigator from Mullingar, Pat Marry says other legal teams will be taking note of the judgement:
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