The NanoMaxx Ultrasound System (SonoSite) in connection with the RP-Xpress (InTouch Technologies) provides a means of transmitting ultrasound images, video, and audio to a remote location in real-time. It has been envisioned that this system be used to diagnose trauma patients with suspected pleural effusion, hemothorax, pneumothorax, or abdominal blockage during prehospital care; under the guidance of in-hospital physicians, paramedics would perform an Focused Assessment with Sonography for Trauma (FAST) examination while trauma patients are transported to hospital via ambulance. The investigators hypothesize that in-hospital physicians interpreting ultrasound images obtained by paramedics during trauma patients' transportation to hospital will reduce time to diagnosis; thus, preparations by emergency physicians, surgeons, and operating room teams to receive critically injured patients may begin earlier, reducing time to intervention during a critical period in patient care. Data will also be collected regarding quality of images obtained in-ambulance and the interaction between paramedics and physicians using the remote-presence system.