What does 19 USC § 1581 state regarding border searches?

The provision under 19 USC § 1581 discusses the authority granted to Customs and Border Protection regarding border searches. This section allows Customs officers to conduct searches of vessels, vehicles, and merchandise at the border without the need for a warrant. Option D specifically highlights the aspect of checking documents of vessels, which is a part of the customs authorities' responsibilities to ensure compliance with import/export regulations and to prevent illegal activities such as smuggling.

This option captures the essence of the duties outlined in the statute, emphasizing that these searches are aimed at ensuring the integrity of goods and compliance with customs laws. Understanding the broader context of customs enforcement shows that this provision is critical for maintaining national security and lawful trade at the borders.