As of July 2011, each of COTT's participating authors are required to sign a disclaimer stating that there is no foul language, explicit sex, or defaming of the name of Christ in their novels. Because COTT staff cannot review every novel to verify this, please read at your own discretion.
I'm not sure what all is included in the term foul language, but The Vengeance Squad does contain two instances of the word "bastard." To be honest, I didn't mean to include the word and didn't know I had until a reviewer mentioned it. In my defense, my characters were dealing with pretty tough foes and got carried away.
There is a lot of discussion among writers of Christian fiction about what to include and what to exclude, but if we want our books in Christian bookstores we need to follow the rules.
I would love to hear how you feel about the use of foul language in books.