Reading the pocket literature

"The documents meticulously record the detainees 'pocket literature' when they were captured: a bus ticket to Kabul, a fake passport and forged student ID a restaurant receipt, even a poem... If a prisoner had a Casio F91W watch, it might be an indication that he had attended a Qaeda bomb-making course where such watches were handed out — though that model is sold around the world to this day. Likewise the assessment of a Yemeni prisoner suggests a dire use for his pocket calculator: 'Calculators may be used for indirect fire calculation such as those required for artillary fire'." — The New York Times