In addition to his interesting analysis on occurrences of the phrase “reasonable expectation of privacy,” Kyle Graham also performed another analysis concerning how “probable cause” has been defined in court decisions over the years. His data, posted here, suggest that the “fair probability” definition seems to have become increasingly dominant over the years. I’ve retabulated his data as a traditional histogram to make the trend easier to detect:
Interesting, although the phrase “fair probability” strikes me as a weaker interpretation or standard for “probable cause” than what I, as a lay person, would have hoped the phrase means.