I did consider building some kind of fraud detection system since there was some suspicion of... treachery. But I didn't know enough about the domain to believ

I did consider building some kind of fraud detection system since there was some suspicion of... treachery. But I didn't know enough about the domain to believe that I could implement something that would work reliably. In fact, my doubts about my domain knowledge is one of the main things that motivated me to build the auditing feature. If something went wrong I wanted to make sure that I could only be blamed for legitimate mistakes on my part. I'm sure the same thing happens with larger systems.