From the National Park Service:
Marcello Bravo, a Grand Canyon National Park concession employee, was arrested by rangers on May 4th for being under the influence of alcohol and interfering with agency functions. Bravo refused to cooperate throughout the booking process. When a ranger attempted to fingerprint him, Bravo grabbed hold of one of the ranger’s fingers, twisting it painfully and causing the ranger to forcefully disengage. Later the same day, the ranger noticed significant swelling on to the top of his wrist. The information regarding the injury was relayed to the assistant United States attorney and the Investigative Services Branch. A criminal complaint was filed for assault on a federal officer (18 USC 111(a)), a felony offense. On May 6th, Bravo pled guilty to a class A misdemeanor assault on a federal officer (18 USC 115(a)(1)(B)) and was sentenced to five days in jail and a year’s supervised release. He was also banned from the park. The ranger suffered a muscle tear and will undergo physical therapy. He returned immediately to full duty status.