Who has copies of your emails? You do, of course, as do all the people you sent them to. But so does Google or Yahoo or whichever cloud email service you use. And emails are just the beginning: more and more of our communications and transactions are happening online and stored by someone for some amount of time. In this new world, the rules that govern grand jury subpoenas may have troubling implications, argues Joshua Gruenspecht, a cybersecurity expert at the Center for Democracy and Technology, in the spring issue of the Harvard Journal of Law & Technology.