A 2255 petition may be filed by a person in federal custody to challenge a federal criminal conviction and/or sentence. Unlike a 2254 petition, which challenges a state-court conviction and/or sentence, a 2255 petition is not limited to federal constitutional claims. 28 U.S.C. § 2255 provides that it may be used to raise claims that your sentence or conviction was unauthorized under any law of the United States.
