"Substantiated complaints" refers to grievances or concerns that have been proven to be true or valid with supporting evidence or proof. Full definition
Currently, lawyers representing New York City are appealing an appellate judge's decision ordering the city to release a summary of substantiated complaints against Pantaleo. (politico.com)
Recall also that three major aspirants here present lodged serious and substantiated complaints against the process of the election. (nigeriapoliticsonline.com)
[11][12] For this reason, we replicated all of the analyses reported below using substantiated complaints instead of reported complaints, and found the same pattern of results. (educationnext.org)