The federal money-laundering statute prohibits both the concealment of proceeds from crime and the use of such proceeds to promote illegal activities. While designed primarily with drug kingpins in mind, the statute’s broad language can easily become a trap for low-level criminals doing fairly routine things. (I posted recently on a good example of an aggressive use of the money-laundering statute.) Expansive readings of the statute mean that the penalties attached by Congress to many predicate offenses become meaningless, as nearly everyone becomes subject to the twenty-year maximum prison term triggered by a money-laundering conviction. Responding to this concern, the Supreme Court recently adopted narrow constructions of the money-laundering statute in two cases, United States v. Santos, 128 S.Ct. 2020 (2008), and Cuellar v. United States, 128 S.Ct. 1994 (2008). The cases may point the way towards a more discriminating money-laundering jurisprudence that attempts to reserve the harsh penalties of the statute for the most deserving defendants.
This important question is explored in a forthcoming mini-symposium in the Boston University Law Review. The lead article, written by Professors Jennifer Collins, Ethan Leib, and Dan Markel, argues that if criminal law is going to be used to enforce the responsibilities of family members to one another, then there also ought to be ways for people in other types of caregiving relationships to make their responsibilities criminally enforceable. 
