No surprise, then, that more than half of teens (54 percent) say they use a hand-held cell phone while driving, similar to the 61 percent of parents who say they do so.

FORBES: Are You A Good Driver? Ask Your Teenager

"There's just so much more potential when searching a cell phone or an e-mail archive, to uncover information that has no relevance to the object of the search, but yet could reveal many private and personal matters, " Silverstein says.

NPR: Text Privacy Issue Heats Up at Colorado School