The Board of Immigration Appeals has determined that “where an expert witness’ background and testimony reflect a reluctance to consider contrary evidence and an inability to impartially assess matters involving the removal of persons to a given country, an Immigration Judge errs in giving the testimony of that witness significant weight.” In this case, the Board cited an expert witness’s co-authoring of an article that called for the cessation of all deportations of criminal non-citizens to Haiti.
The full text of Matter of D-J-L- can be found here: https://www.justice.gov/eoir/media/1430046/dl?inline