Who decides that an on-site inspection request is granted?

The request for an on-site inspection must be based on detailed information about the suspicious event that triggered the request. This information would come from monitoring data of the IMS but also from data generated by national monitoring systems.

A request for an on-site inspection is sent to the Director General and the Executive Council of the CTBTO.  The Director General forwards the request to the State Party that is the subject of the inspection request and seeks its clarification. The resulting information, as well as relevant IMS monitoring data, is then made available to the Executive Council. At least 30 of the 51 Council members need to support the request for it to be approved.

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