Watch FilmoFlix. Perita (Expert Witness) is a short documentary about the 2016 trial of military leaders for crimes against humanity in the form of sexual violence against indigenous women. This was the first criminal trial for sexual slavery as a weapon of war ever heard in a national court. Velásquez Nimatuj served as an expert witness, bringing forth testimony gathered from many of these indigenous women. Both military leaders were found guilty and each sentenced to over 100 years in prison.