The following pdfs from Westlaw are older, but the basic steps set out are still valid"
Searching for Circuit Splits or novel issues in case databases:
Simple search query in a case law database:
(circuit* /s split*) AND yourtopic
court or circuit /s split & da(aft 1/2015)
Advance search query in a case law database:
conflict! or split! or division or divid! /10 authority or preceden! or lower court or circuit or state supreme court and yourtopic
issue or question or matter /s "first impression" or novel & da(aft 1/2016)
In law review databases search:
"beyond the scope" /s (note or article or comment) and da(aft 1/2015)
Search recent legal news or specialty news
"novel issue" or "open question" or unresolved or "circuit split" or courts /5 agree! or disagree!