Letter: Modern nuclear tests pose no harm

Nuclear weapons are precisely designed and constructed devices that of necessity employ materials that degrade over time. This degradation must be monitored and, if necessary, corrected to ensure their ongoing safety and reliability.The political decision to stop all testing in the U.S. was undertaken to encourage other nations to do likewise. While this policy has not been effective internationally, it has made it very difficult for the scientists and engineers in this country to certify the on