If Congress follows through on its plan to take up criminal-justice reform next year, legislators and advocates could wrestle once again with an obscure proposal that would reshape federal criminal laws—that is, if it doesn’t imperil the reform effort first.

A bill drafted by a group of Senate Republicans earlier this year would tweak the mens rea requirement in federal statutes, adding a default rule for juries to find criminal intent for federal offenses that don’t explicitly have an intent standard. (Mens rea is a legal term derived from the phrase “guilty mind” in Latin.) If enacted, federal prosecutors would need to prove a defendant’s state of mind to obtain a conviction for a host of existing crimes. Conservatives and criminal-defense organizations argue the measure is a necessary part of the congressional effort to reform sentencing and incarceration.

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