At Panama’s National Institute of Oncology in November 2000, 28 cancer patients were overexposed (PDF) to radiation because of a technical error in the medical equipment. The software, created by a U.S. company, Multidata Systems, was designed for a radiation therapist to draw four “blocks,” which will protect healthy tissue from radiation, on the computer screen. But doctors discovered a way to draw five boxes. They were unaware of a glitch in the system that caused the device to release twice the radiation when the boxes are drawn a specific way. Nine of the patients have since died, with five of the deaths attributed directly to lethal radiation exposure.