That treaty established standards for conditions for soldiers injured or captured during wartime.
VOA: special.2009.07.26
If a compliance issue arises and a party wants American personnel to serve as "honest brokers" to mediate the issue or monitor specific treatyconditions, that party could invite those personnel in on a case by case basis.
Christian Noyer, the vice president of the European Central Bank, as well as figures from the mighty German Bundesbank, don't want any countries to use the euro until they have painfully satisfied all the Maastricht Treatyconditions, like balancing the government budget, or at least coming reasonably close.
U.S. ratification of the CWC, however, would have the opposite effect, and thus, despite the good intentions of many of those who produced the treaty, create conditions that would make chemical warfare more rather than less likely.