Let’s say I wanted to find this case, Mayfield vs. United States (a December 10th, 2009, U.S. Court of Appeals for the Ninth Circuit opinion). (And I might want to find the case so I can write a postscript to this Shaggy (Law Librarian) Dog Tale.)
When I use Google Legal Scholar, specifying federal court and 2009, and the search <brandon mayfield united states> I get nothing. When I use the same search in native Google, with only the date limiter, I get in the first page of results several links to the actual case, including the link on the court’s website.
There are a number of technical reasons for this (and a few flawed human being reasons, too), and I will leave those to be explained by Search Engine Scientists, but woe to the untrained (or unthinking) legal researcher who thinks that Google (or that other “I looked it up on The Internet” place) is where one researches an actual case.