New York Attorney General Eric Schneiderman has sent letters to several smartphone makers asking them to explain what they're doing to deter thefts, Bloomberg reports. Apple, Google, Microsoft, and Samsung are said to have been contacted on May 10th. "I seek to understand why companies that can develop sophisticated handheld electronics, such as the products manufactured by Apple, cannot also create technology to render stolen devices inoperable and thereby eliminate the expanding black market on which they are sold," reads Schneiderman's letter to Apple CEO Tim Cook.