~2e ANSWER We have never stated that it is impossible to establish an enforce~able ban over all nuclear weapons tests. What we have maintained is that within the terms of the Geneva system recommended by the 1958 Conference of Experts, it appears that at this particular time, it is not possible to establish adequate controls over all possible testing environments. With significant changes in this system--and that is what the statement you referred to suggests-~-an enforceable total ban is certainly possible. However, the Soviet Union has, throughout the negotiations, insisted that the control system be based on the 1958 findings of the experts, REPRODUCED AT THE DWIGHT D. EISENHOWER LIBRARY It is this fact that indicates we should seek a phased approach, and limit the prohibition to the areas in which the Geneva system with such improvements as can be agreed is effective.