If door to door work is really the best way to get the message across why are so many witnesses so bad at it.
why is the society still using supposedly 1st century techniques when there are so many better ways to accomplish this. If it is so important to find people why do they never go where the people are e.g. facebook and the internet?
what is the real purpose of Field Service? If it is not to find people then it is a tool of control.