An inquiry into whether Carwyn Jones misled the assembly over claims of a bullying culture in a previous Welsh Government has found he did not breach the ministerial code.
James Hamilton said he found no evidence Mr Jones saw allegations of bullying by special advisors.
Answers given by the first minister were accurate and truthful, he said.
Mr Jones was accused of misleading AMs when he said no allegations of bullying were made in 2014.
Claims that Mr Jones had heard allegations of bullying emerged following the death of Carl Sargeant, who died days after Mr Jones sacked him from his cabinet.
Former local government minister Leighton Andrews and a former special advisor had alleged a toxic atmosphere within the Welsh Government.
Mr Jones referred himself to an independent inquiry after he was accused of misleading the assembly when he said no one at the top of this government had complained about bullying in 2014.
Mr Hamilton, a former Irish prosecutor, said he found no evidence before 11 November 2014 of any reports or allegations of bullying by special or specialist policy advisers.
“There were allegations made subsequently that there had been a toxic atmosphere or bullying culture in the ministerial floor of Ty Hywel in 2014,” he said.
“I did not find convincing evidence that this was the case.”
Mr Hamilton added that he did not “consider the first minister to have misled the assembly when he said on 14 November 2017 that all issues had been dealt with,” he added.