Upvoted for bringing up the intelligence community's viewpoint on trust. I would say we could find some very interesting research on trust from that area. I think that because the intelligence community seems to be adversarial to a large degree. The problem of the double agent or mole, for example, would very likely lead intelligence agencies to invest heavily in metrics of trust.
The last job fair I went to I looked into a career with the CIA. I found they have extremely strict rules on who they hire, up to and including personality traits like patriotism.
One of the more important types of decisions is deciding who to trust and about what, but I don't think I've seen any discussion here about rational methods in that area.
Any suggestions?