I wrote a script that would check every outgoing phone call from the law firm against a hit list of area codes and telephone prefixes. And my list of numbers included, guess what? Right: the FBI and U.S. Attorney’s offices in Los Angeles and Denver. If a call was made to any number within those agencies, the script I wrote would send a message to my pager with the code "6565"—easy for me to remember because it was the last four digits of the main number assigned to the Los Angeles FBI office.