Hany Farid is an expert on photo fakery and develops tools for detecting whether and how much pictures have been ginned up by, say, advertisers hawking beauty products. He's testified about the veracity of photos in court cases, uncovered audacious forgeries, and helped authenticate some iconic images. We had a fascinating conversation about truth and deception in the age of Photoshop: the ways digital retouching has altered our relation to photography, sowed confusion in the legal system, altered our body images, and sparked a race between the technologies of authentication and tools for photo manipulation.