"Circuit splits provide great writing opportunities because their existence suggests that lawyers and judges were not able to come up with a viable, widely accepted solution to the problem on their own."
Nicholas J. Wagoner, 3 Reasons Why Circuit Splits Matter: Legal Scholarship, Circuit Splits (December 17, 2011).
Try the following search in cases on Lexis or Westlaw:
(circuit or court w/s split) AND [insert terms or phrases to narrow the search]