How do you ensure someone upholds a code of ethics? Licensing is not the answer. I'm sure there are many PEs that find themselves in similar situations.

I know examples of people in licensed fields who have sworn to uphold a code of ethics, but have been caught up in very similar situations.

I can't find it now but I just saw a video recently of a rail bridge with a crumbling foundation that had just been signed off on by a PE and declared safe by the railroad.