The word "corroborative" means providing evidence or support for something, making it more believable or reliable. It shows that there is additional information or facts that back up a statement or claim. Full definition
The prosecution had failed to obtain the key piece of corroborative evidence for the trial. (newlawjournal.co.uk)
One reason why the bar is set high for corroborative evidence is because using hearsay statements in court is inherently risky business. (thecourt.ca)
If you can't be found it could be reason enough to eliminate you as a potential candidate due to insufficient corroborative information. (aneliteresume.com)