A game is being developed now for a 2005 release. It'll probably suck because most licensed games do.

From cinescape.com:

http://www.cinescape.com/0/editorial.asp?aff_id=0&this_cat=Games&action=page&type_id=&cat_id=270351&obj_id=40972

Video Game News
THE SHIELD gets game
This ain't no cop rock
Dateline: Wednesday, March 3, 2004

By: PATRICK SAURIOL
By: News Editor
Source: The Hollywood Reporter, Gamespot

Here's something that we didn't see coming, but now that we know about it, makes perfect sense: the rights to make a video game of the FX network's hard-edged crime drama THE SHIELD have been picked up by Sammy Studios. Michael Chiklis, the Golden Globe-winning actor who plays dirty cop Vic Mackey in the series, is in negotiations to lend his voice and likeness to the game. Deals for the same are also being negotiated with the remaining cast members from the series. Developed by Point of View, the third-person game will let players choose from different approaches to taking down thugs and criminals on the streets of L.A., ranging from following the law to the letter to taking bribes, roughing up informants and planting evidence.

Sammy Studios is the publisher behind such titles as LETHAL SKIES II, the GUILTY GEAR titles and SEVEN SAMURAI 20XX, set for release on March 24. The company is aiming for a release for THE SHIELD game sometime in the first quarter of 2005.