Routine security screenings are nothing new at the border—but the routine is changing. These days, in addition to questioning travelers and inspecting their bags, it is increasingly common for federal agents to demand that U.S. citizens hand over their smartphones and security passwords. This is a problem, writes Alan McQuinn in RealClearPolicy. Digital devices can provide access to vast amounts of information that may be significantly more sensitive than officials would ever find in typical baggage. Congress should step in and ensure these devices are subject to a higher level of legal protection.