The USPTO Audit Program The U.S. Patent and Trademark Office (USPTO) recently announced that it will conduct random audits of about 10 percent of all post-registration Declaration of Use filings going forward. This is a permanent extension of a pilot program launched by the USPTO in March 2017, following reports of increases in fraudulent claims of use and overly broad listings of goods and services by trademark applicants
情報源: How to Avoid Losing Trademarks to the USPTO Audit Program – Lexology
Post Registration Proof of Use Audit Program (USPTO WEBSITE)