Commercial law, or business law, governs all aspects of the sale of goods and services. In the United States, interstate commerce laws are codified in the Uniform Commercial Code (UCC). Each state has adopted an identical or modified version of the UCC that governs intrastate commerce. Any company engaged in business transactions should seek the counsel of an experienced commercial law attorney when creating and modifying sales contracts and other negotiable instruments. Commercial law lawyers can also assist your company resolve a variety of business disputes, including commercial litigation, vendor disputes and leasing problems.