Method validation/verification

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I am employed by an ISO 17025 accredited laboratory testing service provider Question(1): Is it necessary to validate/verify a) mongraph methods described in the: United States, British & European Pharmacopoeia b) validated methods supplied by the customer? Question (2): What is considered to be sufficient evidence of the laboratory's competence to perform the tsets? We do some sort of system suitabilty with each analysis as well as take part in anual Interlab. Profficiency schemes.