Teacher's edition.

• Author: Rebhun, Elliott
• Position: Brief article

Chances are that your students, like most Americans, don't go anywhere these days without their cellphones. But most people don't realize that these increasingly sophisticated devices can be used to track their every movement. In "Could Your Cellphone Testify Against You?" we examine the increasing use by law enforcement officials of cellphone tracking to investigate and prosecute criminal suspects, and the Constitutional questions it raises about privacy rights and Fourth Amendment protections on searches.

Our cover story looks at Brazil, whose selection as the first South American nation to host an Olympics confirms its rise as a global power. It's a remarkable story of economic and political growth: The bottom line is that in a growing number of middle-class families, teens can look forward to expanding opportunities in their...