here is the blurb from the Websites FAQ page;
How does FairFight™ Work?
Algorithmic Analysis of Player Statistics (AAPS) compares each player's game play statistics across an array of performance measures and compares them against averages derived from all of the gamers playing your game. FairFight uses the results of these comparisons to find statistical anomalies that correlate strongly to the use of cheats.
In order that highly skilled players are not erroneously flagged as cheats, FairFight uses Server Side Cheat Detection (SSCD) to cross-compare results. FairFight's SSCD monitors the game state in real time, scanning gameplay data of your choice for events and conditions which are not possible (or that are exceedingly improbable) to achieve without the use of hacks. For example, in a given first person shooter it may be impossible for a weapon to kill (or even hit) a player over 200 yards. When FairFight sees this occur it automatically records it as a validation of any anomalous AAPS findings. With the validation event in place, FairFight will take any number of actions that you have selected, and it will do so when you want it to (immediately, after a delay, player join . . . .) FairFight's combined AAPS and SSCD approaches offer the best cheat detection and suppression tool in the industry - and it functions in real-time.
FairFight's customizable GameChanger rule engine and graduated punishment system can be modified throughout the course of a title's life, allowing you to Make it a FairFight™ for everyone all the time. Publishers can 'harden' or 'soften' detection thresholds and ban penalties, and add or eliminate statistical measures to meet their needs. For incorrigible hackers, FairFight maintains a Suspension List that is regularly updated with players flagged as 'cheaters'. 'Watch lists' can be created for continuous and even closer automated or manual monitoring. Temporary and permanent suspensions can be imposed, and, depending on your desire, 'hackers' can be barred on a single title or across multiple titles.
Since FairFight is a server side system, integrating FairFight into your game will be seamless. In other words, we won't screw up your game. Also, since FairFight is connected only via the API, if we ever have a connectivity or security problem (and we go to great lengths so we don't) the gameplay on your title should continue unaffected while we get reset.