RedactedNarrative: On 05/31/2019 around 2150 hours, I, Cpl. was on marked vessel patrol of Deep Creek Lake in the main body adjacent to the Glendale Bridge. At the time, I was adrift approximately 400 yards north of the Glendale bridge with my navigation lights on but my motor cut off, to better hear vessels traveling at night without proper lighting. The winds were calm with mostly cloudy skies. The shoreline was heavily back-lit with all the lake homes' outdoor lighting and/or dock lights. The back-lit effect caused the shore lights to also be reflected on the calm water surface, causing a slight disorienting effect when traveling on the water at night, particularly with no moon illumination. One way to compensate for the reflected light confusion and operate safely is to simply slow your travel speed and maintain a proper lookout. There was a small fishing vessel engaged in trolling activity, moving at a very slow speed with the aid of an electric motor affixed to the bow, this vessel was on my port side and north of the Glendale bridge also. The fishing vessel was properly illuminated with red and green bow lights and a bright white stern light, traveling in a northeast direction towards the state park ramp area. Besides the fishing vessel and myself, there was no other vessel activity around the Glendale bridge, state park cove area, or waterway between the Glendale bridge and the state park boat ramp.
  
       As I watched the fishing vessel for a moment, I suddenly heard the high pitched whine from the boat motor of an approaching vessel heading towards the Glendale bridge at a high rate of speed. I was able to identify the sound of a vessel approaching the bridge at a high rate of speed, based upon my knowledge, training and experience as a Maryland Natural Resources Police officer and ten years of marine patrol assignments. I saw the red and green bow lights of the approaching vessel and the blurred outline of several people on-board using the bridge navigation lights . The approaching vessel briefly slowed as it neared the concrete bridge abutment and then quickly accelerated again after passing underneath the bridge. Several seconds went by and I suddenly heard a resounding heavy boom, almost like a cannon fire, directly on my port side and realized that the speeding vessel had just struck the fishing vessel at full throttle. As my motor was still off, I could hear immediate screaming, heard someone yell that a person was in the water and another voice yell that there were children on board. I also immediately recognized that the motors of both vessels were cut off and the vessels weren't moving. 
  
       I immediately notified DNR Communications that a serious boat accident had occurred on Deep Creek Lake and I needed emergency personnel and medical services to stage at the Deep Creek State Park boat ramp. I activated my emergency equipment and fortunately was only approximately 200 yards from the scene. I turned on the patrol vessel search lights and saw one man floating in the water with a life-jacket under one arm and a Type IV personal flotation device in the other hand. The victim in the water was out of breath but said he thought he was okay; the striking vessel (MD 7548 BG) operator was still in his vessel, bleeding from the face but able to communicate and the four occupants in the victim vessel (MC 5703 RX) were still on-board their vessel and able to communicate. The four occupants in the victim vessel advised they seemed to be uninjured and were all accounted for, the man in the water was a passenger on the striking vessel. 
  
  The victim in the water was the immediate priority so I motored over to him and cut my engine, throwing a line off the stern for him to grab onto and pull him towards my swim platform. I was unsure of possible neck or spinal injuries on the victim after he was ejected at such a high speed onto the water, so I decided to use my motor and propeller as a stepping/guiding platform to raise him to the swim platform, where I was able to more gently grab his upper body and help him slide into my vessel from the stern. The victim advised he was shaken and his leg hurt, I could see bleeding through his right pant leg and several scratches on his face and right shoulder. I had Subject1 seated comfortably inside my vessel and told him medical attention was waiting for him at the dock.
  
       At this time, Cpl. arrived on scene in another patrol vessel and was able to attend to the victim vessel and four occupants. The victims' vessel had disabling damage and was placed in a side tow by Cpl.. All four occupants were shaken but said they didn't appear to be injured; the two children on board were wearing their life jackets and seated with their father. The victim vessel operator/owner2 tried to turn his vessel to starboard to avoid the collision but didn't have enough time. The adult passenger and father of the two children, said he had a second to scream to the children to lay down flat on the floor and they all hugged the starboard side of their vessel. At that time the striking vessel hit the engine of Operator2's vessel at the stern, rode up the stern of the vessel, traveling through the occupied interior with the propeller still turning at full throttle and exiting through the port side windshield. The striking vessel came to rest about 100 feet from the victim vessel after suffering major engine damage. There were significant propeller "strikes" throughout the interior of the victim vessel, marking the path of the striking vessel as it travelled up and over. 
  
  The striking vessel operator suffered facial damage when his face struck the operator side windshield of his vessel sometime during the collision. Operator1's bottom teeth tore through his lower lip and he appeared to have scratches to his face. Operator1's immediate concern was for his passenger that was ejected and the well-being of the victim vessel occupants. 
  
  Operator1 said that he had operated a vessel on Deep Creek Lake for years and was very familiar with the lake layout. Operator1 said that he was running about 40 mph south of the Glendale bridge, slowed to about 30-35 mph at the bridge while looking for fishing vessels near the abutment, seeing none under the bridge, he then accelerated back up to about 40 mph heading north in a straight line for the Deep Creek Lake state park boat ramp. Operator1's vessel and the victim vessel were both pointed in the same northeastern direction and Operator1 would only have seen the white all around stern light of Operator2's vessel. 
  
  At the last second, Subject1, the passenger on the striking vessel, said that he saw the green bow light of Operator2's vessel as he hurriedly tried to avoid the collision and screamed, "Boat!." but the next instant was flying through the air and hit the water around 40 mph. Subject1 said that he "felt uneasy and should have told (Operator1) to slow down", but Operator1 advised that he had run that route dozens of times and knew the lake like the "back of his hand". Operator1 advised that he was focused on the lights illuminating the state park boat ramp on the eastern shore of the lake and didn't notice any additional lighting around him.
  
       Operator1 was asked about any alcohol or drug use, Operator1 advised that he had not been drinking that day and no alcohol was found on the striking vessel. Operator1 showed no signs of impairment and no odor of an alcoholic beverage was coming from his person or vessel. Both vessels were placed in side tow and towed back to the state park ramp to waiting medical personnel. All six individuals involved in the collision refused any medical treatment or transport to Garr
  