An amateur sleuth tracks runners who cheat. But how far should he go?

How an economic boom and deep gender inequality have created a new industry.

Roger Goodell, the Patriots and one huge “makeup call.”

On the adultery website AshleyMadison.com.

Alberto Salazar is one of the most celebrated running coaches in the world. Is he also a cheater?

Inside the world of bass fishing cheaters.

Nancy and Frank Howard were happily married for three decades. Then he fell in love with another woman, embezzled $30 million, and hired a parade of inept hit men to kill his wife.

A profile of Ken Regan, a computer scientist, chess master, and world champion at detecting cheaters in chess.

The Giants' miraculous 1951 comeback wasn't all that it seemed.

Previously: The Longform Guide to Cheaters.

A profile of former South Carolina governor Mark Sanford, who is running for office four years after his affair with an Argentine journalist became national news.

On the battle between Shaquille O’Neal and his former IT guy, who’s in control of much of O’Neal’s archived (and often damning) correspondence.

On why the Anthony Weiner story makes people more uncomfortable than simple cheating, the shifting meaning of faithfulness in marriage, and the relationship ideals espoused by Dan Savage:

In Savage Love, his weekly column, he inveighs against the American obsession with strict fidelity. In its place he proposes a sensibility that we might call American Gay Male, after that community’s tolerance for pornography, fetishes and a variety of partnered arrangements, from strict monogamy to wide openness.