The next president should be more forthcoming in disclosing the legal rationale and effectiveness of the government?s surveillance programs. ?Just trust us,? its default response to reasonable requests for more information, simply isn?t enough. The latest instance involved reports earlier this week that Yahoo was compelled last year to screen all messages for a specific type of correspondence the government was interested in spotting, as part of surveillance of a state-sponsored terrorist organization. Left unsaid was whether it worked and whether other email providers have been issued similar secret orders.