Issa: You're not an expert on tobacco, you're not an expert on guns. Are you an expert on explosives?
Dettelbach: I have prosecuted cases involving the attempted terroristic bombing of a bridge in Ohio…I don't hold myself out as a technical expert in every aspect of firearms, but I'm an expert in dealing with violent crime.
Issa: You know what a prosecutor knows; you have no expertise, specifically, in what the men and women of the ATF are experts on.