The Exchange 11/2/09 IOWA (kuni) - Ben Kieffer talks with David Nichols, the internationally recognized expert on LSD and other substances. Nichols is featured in the National Geographic Channel special, EXPLORER: INSIDE LSD premiering this week. Later in the hour- a conversation with White House Office of National Drug Control Policy Director Gil Kerlikowske. Kerlikowske is in Des Moines to conduct a roundtable discussion with Iowa officials to help him shape President Obama's first National Drug Control Strategy. © Copyright 2009, kuni