In the adventure activity industry, many companies still use a 'waiver' - an agreement with activity participants that says (amongst other things) something along the lines of..
"This adventure activity involves inherent risks....Company-ABC cannot guarantee your safety.....I hereby assume all risks and release all persons connected with Company-ABC from all liability of injury...I acknowledge that Company-ABC accepts no responsibility for the actions of their employees, contractors...." — Riki Brown
If you are interested in workplace health & safety in New Zealand, then this is the discussion forum for you.