What did john marshal rule in the aaron burr trial?

In the Aaron Burr trial, Chief Justice John Marshall ruled that the evidence presented by the prosecution was insufficient to convict Burr of treason. Marshall emphasized that treason requires clear evidence of an overt act and that mere conspiracy or intention was not enough for a conviction. He also defined the strict criteria for what constitutes treason under the U.S. Constitution, ultimately leading to Burr's acquittal. This ruling reinforced the principle of requiring substantial evidence in treason cases.