Immigration.
When a petitioner asserts a reliance on prior precedent and there is a genuine issue of retroactivity, but the record is insufficient to describe the claim, the case should be remanded to the agency for the development of the record.
https://d3bsvxk93brmko.cloudfront.net/datastore/opinions/2015/12/30/12-72126.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.