On the question of security, it must be asked if there is a hierarchy of rights and occasions arise when there are competing priorities in terms of vindicating them. In this regard and in order to protect the security of the individual, the State has considered it prudent to enact prevention of terrorism legislation which may, in normal circumstances, be considered unnecessary. For example, the legislation providing that a Garda chief superintendent can give evidence that may be accepted by a court would normally not be considered desirable, when more substantial proof would be required.