One of the most specific branches of lawyers is toxic tort lawyers. They specialize in lawsuits and settlements over personal injuries caused by poisonous and hazardous materials. Exposure to toxic pharmaceuticals, chemicals, products, or environmental factors may cause serious health issues; the most common toxic tort cases deal with asbestos exposure or class-action lawsuits against pharmaceutical companies. To practice law in this field, lawyers need to pass the bar exam to represent their clients in court.