When sourcing accident cars, you must categorize them by damage type: cosmetic, mechanical, or structural. Prioritize vehicles with clean titles or repairable salvage certificates rather than 'Parts Only' or 'Non-Repairable' designations unless your business model is strictly dismantling. Always request a comprehensive damage report and high-resolution photos of the chassis, engine bay, and deployment status of airbags. For wholesale lots, ensure the structural integrity of the frame is intact, as frame damage significantly increases repair costs and reduces resale safety.