 The problems with the suggested use of a test are various. First, there is the sheer administrative scale of its employment in such a case as human rights. Second, there is the problem of agreeing a determinate procedure for testing. How exactly are we to examine someone in respect of their competence to possess rights? Third, there is the problem of fairness. Any test must not unfairly disqualify some group of putative rights-holders by, for instance, having a bias in the testing procedure which, in effect, discriminates against that group. Fourth, the administration of any official test—and especially one whose passing yields such important goods—is subject to the risks of corruption or of misuse for the self-interested ends of those administering it. Again this can not be true of the use of age as a threshold. To summarise, these problems attaching to the use of a test are large and insuperable. The charges of arbitrariness can be argued to be false or overstated. Children do differ from adults in respect of their competence to possess rights. A threshold of age may be the appropriate way to register that difference. One should, thus, acquire rights only on reaching a certain age. However, two riders to this summary are appropriate.