Baker said when he booked his trip to Yellowstone National Park he wanted to make sure he packed his insulin, pump, and syringes according to the Transportation Safety Administration's regulations. The TSA requires passengers who carry syringes to pack them in a bag that will be checked and screened at the airport. The patients are also required to purchase a lock with a special symbol, which allows federal agents access to their suitcase. Baker said he took an extra precaution.