Socially responsible investing often sounds like an intriguing idea, but investing plan assets in a socially responsible manner is a notoriously tricky proposition. Earlier this year, the US Department of Labor issued additional guidance clarifying existing DOL guidance applicable to socially responsible investment of plan assets. However, the clarifications included in FAB 2018-01 may further limit the scenarios in which socially responsible investing could be considered prudent under the Employee Retirement Income Security Act of 1974, as amended (ERISA).