UK - Three German journalists breached the tight security cordon around the April 2 Group of 20 summit in London and managed to eavesdrop on the three-hour discussion between heads of governments...
Despite wearing the wrong identification badges Marc Hujer, Wolfgang Reuter and Christoph Schwennicke walked unchallenged into the G20 “listening room”, where government officials were listening in on talks between government heads such as Barack Obama, the US president, and Nicolas Sarkozy, his French counterpart, said one person present during the incident. “It’s not that they sneaked in, they just walked in.”
The reporters went on to write a detailed account of the discussions, which appeared in Spiegel, the weekly magazine, on April 6, detailing the debate that led to the drafting of the final summit communiqué and repeatedly using verbatim quotes from the discussions. (more)
We see similar tactics attempted at corporate off-site meetings we protect. Everything from "blenders" (people who meld with the herd) to pre and post meeting "paper-hunter-gatherers." Make sure you have a knowledgeable counterespionage specialist watching over your meetings. They will do more than just catch bugs.