72The prevailing principle of Community law is the unfettered evaluation of evidence and the sole criterion relevant in that evaluation is the reliability of the evidence (Opinion of Judge Vesterdorf, acting as Advocate General, in Case T-1/89 Rhône-Poulenc v Commission [1991] ECR II-867, II-869; see also, to that effect, Joined Cases C-310/98 and C-406/98 Met-Trans and Sagpol [2000] ECR I-1797, paragraph 29, and Joined Cases T-141/99, T-142/99, T-150/99 and T-151/99 Vela and Tecnagrind v Commission [2002] ECR II-4547, paragraph 223). Moreover, it may be necessary for the Commission to protect the anonymity of its informants (see, to that effect, Case 145/83 Adams v Commission [1985] ECR 3539, paragraph 34) and that fact alone cannot require the Commission to set aside evidence in its possession.
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