Prepared by the District of Columbia Street Law Project for its 23rd annual city-wide mock trial competition, this instructional handout provides the material for a mock civil trial over an accidental shooting. Thirteen-year-old T. J. Walker, Scott Walker's son from a previous marriage, visited the home of 5-year-old Jesse Walker with a pistol owned by Carl Newhouse, the man living with T.J.'s mother, Tanya Brewster. During a scuffle over the pistol between Jesse and T.J., the gun fired, severely injuring Jesse. For the cost of Jesse's medical expenses, Jesse's father, Scott Walker, brings suit against Tanya Brewster, charging her with negligent storage of a firearm and negligent supervision of a minor child. The handout clarifies the laws and explains the legal precedents. As evidence, the handout provides the medical bill for Jesse's injury; the official transcript of the emergency call; the Department of Public Safety's instructions for the safe storage of handguns; and witness statements from Scott Walker, T.J. Walker, medical professor Dr. Sandy Turner, Tanya Brewster, Carl Newhouse, and Terry Bottner, a juvenile diversion counselor. Through participation in mock trials and analysis of the activity, students gain an insider's perspective on courtroom procedure and a basic understanding of the legal mechanism through which society resolves its disputes. Mock trials develop critical analysis, questioning and listening skills, and skills in preparing and organizing materials. (JD)