The Irish Constitution contains a pre-enactment abstract review procedure under Article 26 whereby, before signing a Bill into law, the President can refer the Bill to the Supreme Court for a decision on its constitutionality. However, only 16 such references have ever been made. The reason Irish Presidents have been cautious about sending Bills to the Supreme Court for abstract review relates to the fact that if a Bill survives the Article 26 review process, it then acquires an immunity from further challenge under Article 34.3.3. This has sometimes been referred to as a ‘seal of constitutionality’ and the absolute nature of this blanket immunity has been criticised because it means that, in practice, the review process is rarely used. By its very nature, abstract review suffers from the defect that the provisions are being looked at in a vacuum, without the benefit of a concrete factual scenario and it may be that circumstances later arise which could result in an unconstitutionality that was not apparent when the Bill was initially examined. For this reason, Presidents will sometimes decide not to refer a Bill, even one which is considered controversial, for fear of closing off the Bill to potential future challenges; they may feel it is better for challenges to occur organically as situations arise rather than to prevent a situation where a future challenge is blocked by the immunity following the review process. As Hogan has put it, ‘[w]ithout a plaintiff, a court may fail to anticipate side-effects or unintended consequences of the law’. The paucity of occurrences means that when the procedure is invoked, there is a great interest (amongst members of the legal and academic communities at least) in the process and outcome.