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US accuses Google of illegal methods to push up ad prices
(www.reuters.com)
This is a most excellent place for technology news and articles.
You need some reasonable grounds to put before a judge before they'll grant a subpoena. A subpoena can confirm what they suspect, it can't be used to blindly fish for evidence.
However it could be that what was in the deposition gives them the grounds. Should be an interesting trial.