The only two states that do not enforce a "non-competition clause" are California and Wyoming, but in the other states it is an easy battle to win (for you that is). However, the "intelectual property clause" holds in all states. This essentially means that if they train you in a unique process/method of doing this form of work, you cannot use their method at another firm. This includes, primarily, use of any contact lists, which it the most common misuse of the clause.
Good luck.