Roles and Responsibilities of an Official Crossword

Health and Safety, Communication and scoring are all examples of these.
If I were checking studs and enforcing rules I would be ensuring this
Netball and Tennis have these
Officals can do this with flags, pens and arms.
this person makes a final decision in a dispute
Trampoling, surfing and gymnastics have these.
Triathlon, motocross and marathon running have these
This is a responsibility that involves making sure all rules are followed
These need to be established and maintained by officials
This is a key role in basketball officiating
Not the first, or the second but the ...... official.
Important person who makes sure that the result is correct