If Turvey is working from stats from police departments, then his data is likely flawed by the fact that most sexual assaults are often improperly investigated.
" the way that most officers continue to investigate sexual assault, is actually the exact opposite of what should happen, Dr. Haskell says, and it’s causing even the most well-intentioned officers to disbelieve real victims.
It all starts with the brain.
When a person fears for their life, the brain’s built-in danger alarm, the amygdala, starts to go off, flooding the body with adrenalin. Blood and oxygen divert to the muscles, and non-essential systems take a back seat. The hippocampus is responsible for filing long-term memories, but in times of intense fear, when the brain is flooded with stress hormones, its functioning is altered. Certain parts of the experience can be totally burned into memory while others are stored poorly or not at all.
What this means for a sexual-assault victim is that their ability to retain memories, especially certain kinds of memories, is impaired. And this is even without the complicating effects of alcohol or drugs.
“So what’s this mean?” Dr. Haskell asks the group of officers she’s training. “If I pulled out a gun right now … what would you be focusing on? You’d be looking at the weapon.
“If I said to you, ‘How many people are in the room? Can you describe the colour of the tie of the guy next to you?’ … You are not encoding the colour of the walls. You are not encoding the clothing. You wouldn’t know how many people were in this room. That’s not how the brain works.”
This is why victims can’t always give a linear account of an attack. Instead, they’ll remember a smell or an image. These are called sensory fragments, and the best way for an officer to gather information is to find these pieces, then work forward and backward from them, without getting caught up in whether a victim can remember peripheral details"
https://www.theglobeandmail.com/news...ticle33891309/
Anyway, read the article and you can see why so many sexual assault/rape cases don't go anywhere.