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On-site inspections are the ultimate measure to verify whether the CTBT has been violated.

Picture this scene! A landscape seemingly untouched by human intervention.  No settlement, no construction as far as the eye can see. And then, suddenly, a convoy of off-road vehicles appears on this peaceful stretch of land. People pour out of them and start unpacking boxes of equipment, erecting tents and building a small camp town, practically out of nothing.

These people could be inspectors, well-trained and highly specialized experts, who set themselves up for an on-site inspection to verify whether or not a nuclear explosion has been conducted somewhere in the vicinity.

On-site inspections are the final verification measure to verify States’ compliance with the CTBT. They are launched to establish whether or not a nuclear explosion has been carried out.
An exercise in Chernobyl, Ukraine, in June 2007, examined radiation measurement procedures.

On-site inspections are conducted to verify States Parties’ compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT). An on-site inspection is launched to establish whether or not a nuclear explosion has been carried out.  During such an inspection, facts might also be gathered to identify a possible violator of the Treaty. It thus constitutes the final verification measure under the CTBT.

Although not explicitly labeled as such, on-site inspections under the CTBT are challenge inspections, as they can only be carried out upon request by a State Party. The State Party subjected to such an inspection cannot refuse to allow it to take place.