>I've seen claims that the average IQ in prisons is roughly equivalent to the average IQ of the general population. The line most commonly mentioned after that fact is "and those are the ones that got caught."
This includes white collar crime and all kinds of non-violent crimes though.
Is it the same for the violent crime subset?
Yes. The biasing function is that (mostly) only the less smart ones get exposed and caught.
Hmm, what would make you assume perpetrators of violent crimes would have a different IQ level than other crimes?
My initial instinct would be that violent crimes are often committed out of passion, and are unrelated to intelligence.