PARIS — A French Amazon warehouse business has been slapped with a 32 million euro fine ($35 million) for using an “excessively intrusive system” to monitor worker performance and activity.

The Associated Press says a privacy watchdog in France made the revelation regarding the fine on Tuesday.

According to AP News, the French Data Protection Authority, also known by its acronym CNIL, said the system allowed managers at Amazon France Logistique to track employees so closely that it resulted in multiple breaches of the European Union’s stringent privacy rules, called the General Data Protection Regulation.

“We strongly disagree with the CNIL’s conclusions, which are factually incorrect, and we reserve the right to file an appeal,” Amazon said. “Warehouse management systems are industry standard and are necessary for ensuring the safety, quality and efficiency of operations and to track the storage of inventory and processing of packages on time and in line with customer expectations.”

The watchdog’s investigation reportedly focused on Amazon employees’ use of handheld barcode scanners to track packages at various points throughout the warehouse. Amazon uses the system to manage its business and meet performance targets, but the regulator said it’s different from traditional methods for monitoring worker activity and puts them under “close surveillance” and “continuous pressure.”

The AP News reports says the privacy watchdog indicated that the scanner, known as a “stow machine gun,” allows the company to monitor employees to the “nearest second” because they signal an error if items are scanned too quickly. The system is also used to measure employee productivity as well as “periods of inactivity.

Under EU privacy rules, “it was illegal to set up a system measuring work interruptions with such accuracy, potentially requiring employees to justify every break or interruption,” the watchdog reportedly shared.