The flaw lay in the weapon's ballistics handling, not its explosivity, so this is something that could never have been revealed in a physical test, the Post notes. The power of supercomputers to model these types of things could negate the need for physical testing, some officials say — but Congress has still not ratified the Comprehensive Test Ban Treaty (although the U.S. abides by it). It turns out not everyone trusts supercomputers. Kyl believes while they are helpful, they're not a substitute for testing, the Post quotes him saying. "That's why, even though we're not testing right now, we should not give up the legal right to test," he said.