The phrase "impartial hearing" means that a fair and unbiased assessment or judgment is given to all sides involved, without any prejudice or favoritism towards any particular party. Full definition
It will never happen if new ideas can not receive impartial hearings. (educationnext.org)
You're going to an administrative hearing overseen by an «Impartial Hearing Officer» (IHO). (law.stackexchange.com)
Most importantly, it would enhance judicial and decisional independence in a way that would strengthen the public's perception of having been afforded a fair and impartial hearing in administrative proceedings. (abajournal.com)