Whether this Court should adopt a test that vacates a conviction where there is a 'reasonable probability' that improper bolstering or vouching testimony affected the outcome of the trial

Question Presented Circuits are applying different tests to gauge prejudice resulting from testimony that improperly bolsters or vouches for the testimony of another witness. The question presented here is: Whether this Court should adopt a test that vacates a conviction where there is a “reasonable probability” that improper bolstering or vouching testimony affected the outcome of the trial. i