Final answer:
Individuals with a private or commercial pilot certificate must not act as Pilot in Command if radioactive material from recent medical procedures is present in their body, as it can set off radiation detectors.
Step-by-step explanation:
No person holding a private or commercial pilot certificate may act as Pilot in Command (PIC) of an airplane that has onboard certain materials that might set off radiation detectors due to recent medical procedures.
For example, some medical treatments involve the use of radioactive isotopes which can remain in the body for a certain period. During this time, individuals can trigger radiation detectors used in airport security.
This is not only a safety measure but also a legal consideration in aviation and health regulations. Such individuals are often advised that they will need to obtain special permission to fly on commercial flights or have documentation explaining their condition to avoid misunderstandings during security screening.
This restriction applies to ensure the safety of the airspace and compliance with security protocols.