In reference to vessels defrauding the US, which USC title section pertains to searching cargo?

The correct choice pertains to 19 USC § 1587, which specifically addresses the authority related to the search of cargo for vessels suspected of defrauding the United States. This section grants customs officers and other authorized personnel the necessary powers to investigate and inspect cargo on vessels to ensure compliance with laws and to prevent smuggling or other fraudulent activities. The focus of this statute is on the ability of officials to take action when there is reason to believe that the cargo might be involved in illegal activities, thereby serving an important role in protecting U.S. revenue and trade regulations.

In contrast, the other sections mentioned do not primarily focus on the authority to search cargo. For instance, 19 USC § 1581 provides guidelines for customs officials to board and search vessels, but it does not specifically mention cargo in the same way that § 1587 does. Similarly, 19 USC § 1703 deals with the seizure of vessels and cargo, while 19 USC § 1595(b) pertains to penalties related to violations of customs laws rather than the search authority itself. Therefore, § 1587 captures the essence of the question by directly addressing the search of cargo on vessels suspected of fraudulent activities.