Most of the world handles international flights separately without needing to do that unless it is an international-domestic connection.
However I agree that in purely domestic airports I don't see how you'd prevent general public from accessing bags. Except India, wherein you need a booked flight to even enter the airport.
However I agree that in purely domestic airports I don't see how you'd prevent general public from accessing bags. Except India, wherein you need a booked flight to even enter the airport.