The defense, meanwhile, has countered with an argument that the aforementioned court order wasn't a valid warrant, because it allowed the feds to delete all collected data, in lieu of submitting them to the court.

ENGADGET: DoJ: Stingray cellphone tracking device falls under Fourth Amendment, but don't ask about it

The failure to comply with a promise to delete all the data was notified to Britain's Information Commissioner's Office (ICO), which said the fact that the data still existed appeared to breach an undertaking signed by Google in November 2010.

MSN: Google admits it did not delete Street View data

Google said it was working with all the investigators and offering to delete all the sensitive data.

BBC: Google's Street View faces multi-state US probe