RedactedNarrative: On August 6, 2016 at approximately 17:12 hours I, Game Warden, was patrolling near Callville Bay Marina on Lake Mead when I received information from the Nevada Department of Wildlife (NDOW) Dispatch advising me that National Park Service (NPS) Rangers were requesting our assistance. Dispatch stated that NPS had received a call about a boat accident at Boulder Harbor. NPS stated that the vessel (V1) involved in the accident had dropped off a female with an amputated finger at the boat launch and then left the area. Dispatch advised me to be on the lookout for a Bentley pontoon boat. Game Warden went in route to Boulder Harbor. 
  
  While in route I was notified by NPS dispatch that V1 had returned to the Boulder Harbor and that Park Ranger was on scene with the operator. 
  
  At approximately 17:19 hours Game Warden and I arrived on scene. V1 was tied to the boat dock at Boulder Harbor and Park Ranger was interviewing the operator. The other occupants of V1 were standing near the vessel. I met with Park Ranger2. Park Ranger2 stated that the female, identified as Crystal Occupant2 had already received medical attention and was being transported to UMC to receive treatment for an amputated right pinky finger. Park Ranger2 stated that they were still trying to determine what happened in the accident and that the occupants had been reluctant to cooperate. 
  
  During Park Ranger interview with Subject1 he determined that Subject1 had been drinking alcohol that day and was possibly impaired. Park Ranger1 conducted standardized field sobriety testing on Subject1. Upon completion of the tests Park Ranger1 placed Subject1 under arrest for operating a vessel under the influence of alcohol. 
  
  One of the occupants approached me and asked what was going to happen with the vessel. I informed Occupant1 that we were conducting a vessel accident investigation and that upon completion the vessel would either be impounded or released. I asked Occupant1 what had happened during the accident. Occupant1 stated that the vessel was headed toward Boulder Harbor when they decided to stop and go for a swim in the open water. 
  
  Occupant1 stated that everyone was swimming in the water except for Occupant2. He stated that they were trying to encouraging Occupant2 to jump in the water to go for a swim with them. He stated that as she went to jump in the water her finger got stuck in the door of the pontoon boat and that it broke her pinkie finger off when she jumped in the water. He stated that they wrapped her hand in a towel, placed the severed finger in ice and headed towards Boulder Harbor. Occupant1 provided a written voluntary witness statement.
  
  All required safety equipment was located on the vessel. 
  
  While photographing the vessel I observed multiple empty beer cans on the floor of the vessel. I was able to locate a possible piece of human tissue stuck on the hinge side of the door which was consistent with the witness statements. I photographed the tissue, the door, and the rest of the pontoon boat. 
  
  Upon completion of our investigation Game Warden and I cleared from the scene at approximately 8:29 hours.