To find circuit splits and jurisdictional conflicts, try using: Bloomberg BNA's USLW; blogs; case law; legal news sources; Am. Jur. 2d & ALR; and (for state statutes) the National Survey of State Laws.
If you're interested in how different states are dealing with common legal issues, check the National Survey of State Laws, which allows for easy browsing.
United States Law Week — available on Bloomberg Law, directly from BNA, reports regularly on circuit splits.
Sample Westlaw Search
adv: court or circuit /s split and date (after 8/2015)
Sample Lexis Search
court or circuit w/s split
After searching, use the timeline to restrict your result to the latest year or so.
adv: court or circuit /s split and discrim!
court or circuit w/s split and discrim!
(Date restrictions can be problematic in Am.Jur. on both Lexis and Westlaw. Instead, once you have broad results, use "Search within results," and use search terms for the topics or areas of law that interest you to narrow your results.)
Sample Lexis "Search Within Results"
court or circuit w/5 split and discrim!
Date restrictions can be problematic in ALR. Instead, once you have broad results, continue to use "Search Within Results," and use search terms for the topics or areas of law that interest you to narrow your results.