The U.S. attorney general is reportedly having a hard time getting information from Volkswagen regarding the diesel emissions scandal.

The automaker is citing German privacy laws as an excuse not to provide emails or other communications among its executives to U.S. officials, impeding the investigation. Recently, the U.S. Justice Department said that Volkswagen has “impeded and obstructed” regulators while providing “misleading information.” Additionally, investigators now say that Volkswagen’s actions limit their ability to identify which employees were aware of or sanctioned the cheating.

Finding those responsible is important to the lawsuits, and penalties would be greater if the court is able to prove top executives were aware of the activity.

It has been a different story in Germany, however, with investigators there saying they have “received everything” that they specifically requested. Under German law, prosecutors are allowed to carry out raids of Volkswagen’s Wolfsburg offices to obtain evidence, which included email exchanges.

“Our patience with Volkswagen is wearing thin,” New York’s attorney general, Eric T. Schneiderman told the New York Times. “Volkswagen’s cooperation with the states’ investigation has been spotty — and frankly, more of the kind one expects from a company in denial than one seeking to leave behind a culture of admitted deception.”

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