The autopsy showed no water in Joey's lungs, but alcohol was found in his system. What i did find is interesting. This might provide perhaps some further insight into this. There are 2 sections.
I copied and pasted & the
reference is listed below at the bottom.
It is stated,
"Quite simply if the pathologist has been asked to autopsy a body that was found in water but does not have any physical injuries or problems with heart disease then the most likely conclusion is that death was caused by drowning and is then listed as death by misadventure."
It is further stated,
"Indeed there may well be occasions when it proves difficult to establish whether or not the deceased was alive when they entered the water; this is because that even if an individual is deceased when they enter the water, providing the body remains submerged for a period of time, then the lungs will fill up anyway. Occasionally a condition called 'dry drowning' may present itself; this is where the deceased's larynx has gone into spasm as water has entered the throat, thus the passage to the lungs is blocked..."
http://www.exploreforensics.co.uk/drowning.html