An Adelaide man accused of possessing information about methods for terrorist acts has been acquitted by a District Court judge.

Cameron Brodie-Hall, 22, stood trial by judge alone charged with one count of possessing a document or record of information for terrorist acts and one count of possessing extremist material.

Mr Brodie-Hall was arrested after federal police allegedly found a book that detailed information about how to conduct assassinations, terror bombings and how to sabotage “the system” during an search at his Dudley Park home in April 2021.

A prosecutor previously told the court Mr Brodie-Hall allegedly told police he was part of a nationalist and extremist group known as the European Australia movement, which was about “preserving white Australia”.

Cameron Brodie-Hall puts up his middle finger as he arrives at court.

The court also previously heard that he allegedly placed a sign over a bridge that stated “conquered not stolen” at an Australia Day rally, making the Nazi salute to passing cars.

In the District Court on Thursday, Judge Paul Muscat found Mr Brodie-Hall not guilty of either charge.

Judge Muscat said he was not convinced – based on the prosecution’s “entirely circumstantial evidence” – that Mr Brodie-Hall was guilty of the alleged offending.

“Having assessed and weight the circumstantial evidence as a whole, I am not satisfied beyond a reasonable doubt prosecution has proved that the defendant was in joint possession of the relevant publication the subject of each count,” he said.

“It follows that the defendant is not guilty of each count.”