The revelation that Clinton’s emails contain potentially “classified” information is far less scandalous than the headlines make it appear. The sheer volume of information now considered classified, as well as the extreme, and often absurd, interpretations about what is and is not classified, make it nearly impossible for officials charged with operating in both the classified and unclassified worlds to do so without ever mixing the two.From the intelligence community’s perspective, the border between these two worlds looks like a brick wall. Many intelligence officials spend their entire day working inside so-called Sensitive Compartmented Information Facilities, designed to be impenetrable to eavesdropping, and using only separate, classified email systems. In these hermetically sealed environments...