The United States Postal Service (USPS) approved some 50,000 requests from law enforcement officials and its own inspectors in 2013 to track Americans’ mail for security and criminal purposes, a New York Times report revealed Monday.

An internal 2014 USPS audit cited by the Times suggested that the protocol for approving the tracking of U.S. mail suffered from a number of flaws, as some requests to track mail were approved without adequate oversight while others didn’t receive immediate attention.

“Insufficient controls could hinder the Postal Inspection Service’s ability to conduct effective investigations, lead to public concerns over privacy of mail and harm the Postal Service’s brand,” the report found.

Read the full story in the New York Times

Write to Justin Worland at justin.worland@time.com.