At least where I am, for an engineer to be held liable their conduct needs to meet the standard of negligence. And realistically, enforcement action only commen

At least where I am, for an engineer to be held liable their conduct needs to meet the standard of negligence. And realistically, enforcement action only commences when the consequences are catastrophic: someone loses their life or severe property damage occurs. The work merely being of poor quality is almost never going to give rise to enforcement action. If you design a crappy drainage system for a road and it double the owner's maintenance expenses because it keeps washing out, you aren't going to get sued.