From Longman Dictionary of Contemporary Englishcast aspersions on something/somebodycast aspersions on something/somebodyformalCRITICIZE to suggest that someone is not as truthful, honest etc as they seem remarks that cast aspersions on the integrity of the jury → cast
Examples from the Corpus
cast aspersions on something/somebody• Criticism of a verdict which casts aspersions on the integrity of jurors may, of course, attract libel actions on that score. 