80It should be borne in mind that, according to that case-law, the competent national authorities may adopt, for areas referred to in the preceding paragraph, a targeted measure of retention using a geographic criterion, such as, inter alia, the average crime rate in a geographical area, without that authority necessarily having specific indications as to the preparation or commission, in the areas concerned, of acts of serious crime. Since a targeted retention using that criterion is likely to concern, depending on the serious criminal offences in question and the situation specific to the respective Member States, both the areas marked by a high incidence of serious crime and areas particularly vulnerable to the commission of those acts, it is, in principle, not likely moreover to give rise to discrimination, as the criterion drawn from the average rate of serious crime is entirely unconnected with any potentially discriminatory factors.
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