The document discusses the evolution of customs in Sri Lanka from pre-colonial times to the modern era. It notes that customs has existed in Sri Lanka since ancient times, as evidenced by inscriptions mentioning customs duties. Under British colonial rule beginning in the early 1800s, the modern customs organization was established with the passage of customs laws. Over time, customs took on additional roles like immigration control and monitoring prohibited goods. Today, customs remains an important revenue collector and regulates international trade and cross-border movement of people and goods in Sri Lanka.