RedactedNarrative: This report is based on the statements that were given by the occupants of the boat:
  
  On August 16, 2014 at approximately 1630 to 1700 hours a group of individuals were recreational cruising westbound along the southern shoreline of Middle Thompson Lake at approximately 5 to 10 mph in a pontoon boat. One individual was heavily intoxicated, throwing up, passing out, and stumbling around on boat. The operator had told Victim to stay seated; however, Victim got up from his seat and began dancing around in the front of the boat. Victim had lost his balance and fell backwards over the railing in the front of the boat and landed in the water. Operator had immediately killed the engine. It was unknown whether Victim was injured from the fall. Victim floated in between the two pontoons of the boat. The occupants did not believe and did not hear Victim come into contact with the propeller/motor of the boat. Victim appeared with his head facing down and arms thrashing in the water behind the boat. The occupants of the boat threw him two lifejackets within reach of his arms; however, Victim was not coherent enough to understand the boat occupants instructions to grab the lifejackets. The occupants said he never lifted his face out of the water. Once the occupants realized he was not reaching for the lifejackets 2 of the occupants subject1 and Operator dove into the water to try and rescue him. However, at this point, Victim was already submerged under water and they were not able to reach him. They continued to search for a few minutes, then immediately went to Logan State Park where they called 911. 
  
  I arrived on scene at Logan State Park approximately at 1830 hours. Lincoln County Sheriff Office and Search and Rescue were already on scene. I interviewed each occupant of the boat. Victim''s body was not located until September 4, 2014 by Flathead County Sheriff Office and David Thompson Search and Rescue. The body was recovered at approximately 75 feet under water. 
  
  The investigation showed that the main contributing factor to this fatal accident was due to the large amount of alcohol that Victim had consumed.  There were other occupants, including the operator of the boat who had been drinking prior to the accident, however, none of these individuals appeared to be intoxicated or showed any signs of impairment. The boat operator was conducted to do a Horizontal Gaze Nystagmus test by a Lincoln County Sheriff Depurty. The Deputy had reported that Operator did not score any clues on HGN and did not show any signs of impairment. Operator refused to blow into a pbt instrument. Through this investigation, I did not see any violations on what the operator of the boat had done or any other occupant of the boat, rather just an unfortunate accidental drowning. The only violation that was noted in this investigation was that the boat operator needed to equip his boat with a type iv throwing device. However, from the statements gathered in this investigation the type iv throw device would not have prevented the victim from drowning.