Aldous Huxley explains his conception of the brain as a "reducing valve" of consciousness in his provocative book, The Doors of Perception. His famous experiment with the psychedelic substance mescaline was an attempt to open this valve and expand his capacity for knowledge. However, many drugs and psychedelics today are seen as simply tools for pleasure or the source of bad habits. Do drugs possess the capability to expand our consciousness and provide meaningful insight? Or are they nothing more than a route to empty delirium? Ken and guest co-host Alison Gopnik take a trip with artist, scientist, and founder of the Beckley Foundation, Amanda Feilding.

The criminal justice system often relies on the testimony of eyewitnesses to get convictions. Yet more and more, psychological science demonstrates how unreliable eyewitness reports can be. Moreover, jurors have all kinds of cognitive biases and unconscious influences, and they rely on dubious folk psychological theories when assessing evidence. So, how should psychological science be used to improve our justice system? Is there a way to figure out whether a particular eye witness report is reliable? Or for a truly just system, must we forbid all testimony that depends on the capricious faculty of memory? John and Ken take the stand with Daniel Reisberg from Reed College, author of The Science of Perception and Memory: A Pragmatic Guide for the Justice System.