Final answer:
People may be required to present a doctor's statement demonstrating medical history and a present medical condition in cases of contagious diseases or when government support may be necessary.
Step-by-step explanation:
In certain situations, people may be required to present a doctor's statement demonstrating their medical history and present medical condition. One such situation is when a person is diagnosed with a contagious disease that poses a risk to the public. In this case, the doctor's statement may be required to ensure the safety of others. Another situation is if a legal inspector believes that a person would become dependent on government support. The doctor's statement may be requested to assess the individual's medical condition.