The first of several trials of humanitarian-aid volunteers ended with a guilty verdict Friday, as a federal judge in Tucson said four volunteers broke the law when they left food and water in a ...

Allegations of “improper communication” between federal judges and prosecutors in Tucson are disrupting criminal cases filed against humanitarian-aid workers. In response to an allegation from defense ...

A disease model is an animal or cells displaying all or some of the pathological processes that are observed in the actual human or animal disease. Studying disease models aids understanding of how ...