predoubter
/ˈprɛdɒubtər/Definitions
1. noun
One who doubts beforehand the guilt of a defendant, especially in a trial.
“The defense team argued that the prosecution’s key witness was a predoubter who had already made up his mind.”
2. noun
A person who questions the guilt of a defendant before all the evidence is presented.
“The media portrayal of the accused as a predoubter sparked outrage among the public.”