Prudent Expert Act
  
It's just the Prudent Person Rule, with a little teeth.
So...you have a retirement fund. It's complex. It's gnarly. It has room for graft, corruption, and misdealings. So you need not be just a prudent person...but a prudent expert. Someone who can smell the bad seeds in the pie, like a hungry bear.
See: Fiduciary Obligation. Prudently.