Is an opt-out organ donation system desirable? Comments on a new law

A law that introduces an opt-out system for organ donation has recently come into force in Wales. The debate surrounding the effectiveness and ethical acceptability of an opt-out system continues, though the available data have still not provided definitive proof that an opt-out system is more efficient than an opt-in system. Systems based on implied consent but with specific safeguards would appear more suitable and more respectful of ethical principles than those based on a more aggressive form of presumed consent.