However a good investigator wouldn't stop there they should be asking questions like:
1) Prior to Dom's employment with PA did he display cowboy, risk taking, non-compliant behaviour? Y/N
2) How did Dom perform in previous checks/CRM courses etc i.e. within TCS system?
Umm, i think i know the answer to question 1. Y (maybe a quick chat with some former employers)
and i think the answer to question 2 may not be in his favour either.