All court opinions are available through PACER for free for registered users.
Additionally, access to court opinions from many appellate, district, and bankruptcy courts are available for no fee in a text searchable format through a partnership with the U.S. Government Publishing Office (GPO), consistent with the E-Government Act.
Opinions are available from more than 130 courts and date back to April 2004. On the GPO website, you can search across all opinions. For example, search "USA v." and all opinions with that term will come up in your results.
Learn more about available opinions and which courts are participating.