By definition the root account will have unlimited access to all data and all processes, so he can do whatever he wants to your data without you even knowing it.
It is all a matter of trust and good old fashioned contracts.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James