Wow, that guy was a serious idiot! Forensics expert? Im guessing his field of expertise is not firearms, or even math for that reason.
"Trigger pull is between 3 and 7 psi so lets just average that out and say 3 1/2psi"
CNN is nototrious for talking out their ass about firearms though. I remember all the scare tactics they were pulling out when the assault rifle ban under clinton came about. The president of the NRA called them out on it though thankfully.
Sad part is that this expert had testified over 300 times as an expert witness before he retired. And as a side note anyone using a .223 in Africa on large game would be charged as a criminal. What a tool and how pitiful that NYC had this person as an employ of their police force. Scary......
The one thing that does get me is every damned time there is some report about a firearm going off in a household the excuse always has something to do with the weapon being cleaned. Why in the fuck is there live ammunition anywhere near a firearm when it is being cleaned? If you want to run rounds through the action go buy some dummy rounds, dummy!