Sounds like a cushy job for three-letter-agency employees, block the flaws your adversaries add and go soft on the ones your own agency added, or at least slow down the process of catching it.
If transparency were taken seriously, that wouldn't be an easy task. And, if it were multi-state, either via multiple states having such an organization or via a collaboration of states and organizations who don't all agree about protecting backdoors for the FBI/CIA/whatever.
