This is what I have heard and why I'm planning to add something like a .357 to my own 9. I'm not sure how this is being an armchair quarterback; the observation that 9s may not stop a perp was not intended as a criticism of the brave policewoman.
As it turns out, Hasam was armed with a very small caliber handgun but with a very high capacity magazine. It is also reported, though I don't know if correctly, that he practiced with handguns quite a bit. So much for those who said a doctor wouldn't likely be proficient (my words, not theirs). So, take what I said with the fact in mind that I was addressing outlandish statements by a few. If the shoe fits, sobeit, but if not; no offense intended.