Normally, the Organisation for the Prohibition of Chemical Weapons (OPCW) carries out inspections when there is a suspicion of chemical weapons being used.
If their assessments coincide then it is considered sufficient proof to go to the OPCW executive council where a state being criticised could challenge the evidence.
Two or three of them would be selected to analyse the samples, together with a set of controls, which would be prepared by the OPCW Central Laboratory, to ensure the quality and dependability of the results.
Fears that the Chemical Weapons Convention will be exploited for the purpose of conducting economic espionage have only been further reinforced by the nature of the appointments to key posts by the Organization for the Prohibition of Chemical Weapons (OPCW).
For this off-site analysis, the Organisation for the Prohibition of Chemical Weapons (OPCW) - the implementing agency of the Chemical Weapons Convention - has established an international network of highly competent so-called "designated laboratories" that routinely undergo proficiency testing to ensure that their standard of analysis is up to the needs.