It is tackles above the shoulder (not waist) that are forbidden (along with striking an opponent with a stiff-arm whilst tackling, tripping, picking up and drop

It is tackles above the shoulder (not waist) that are forbidden (along with striking an opponent with a stiff-arm whilst tackling, tripping, picking up and dropping a player etc.). Law 10.4 specifies what is considered 'dangerous play': http://laws.worldrugby.org/?law=10.4 http://laws.worldrugby.org/?law=10.4