A snip from Casetext’s blog post, Cite-checking the Smart Way: An Interview about SmartCite with Casetext Co-Founder and Chief Product Officer, Pablo Arredondo (May 15, 2019):
“SmartCite was developed through a combination of cutting-edge machine learning, natural language processing, and experienced editorial review. Let’s start with the technology.
“SmartCite looks for patterns in millions of cases and uses judges’ own words to determine whether a case is good law and how a case has been cited by other cases. There are three key data sources analyzed by SmartCite. First, SmartCite looks at “explanatory parentheticals.” You know how judges will summarize other cases using parentheses? By looking for these phrases in opinions, we were able to extract 4.3 million case summaries and explanations written by judges! These explanatory parentheticals provide what I call “artisanal citator entries”: they are insightful, reliable, judge-written summaries of cases.
“The second key data source leveraged by SmartCite are phrases in judicial opinions that indicate that a case has been negatively treated. For example, when a judicial decision cites to a case that is bad law, the judge will often explain why that case is bad law by saying “overruled by” or “reversed by” or “superseded by statute, as stated in…” The same is true with good law. Judicial opinions will often indicate that a case is “affirmed by” another case.
“The third data source we use are Bluebook signals that judges use to characterize and distinguish cases. Bluebook signals can actually tell us a lot about a case. For example, when a judge introduces a case using “but see” or “cf.” or “contra,” the judge is indicating that this case is contrary authority, or that it has treated a legal issue differently from other cases. These contrary signals are powerful indicators of tension in the case law.
“However, using machine learning to look for judicial phrases and Bluebook signals is only the starting point of SmartCite’s analysis. We also rely on experienced editors to manage that process, review the case law, and make decisions on the ‘edge cases.'”
See also this page for SmartCite product information.