The full answer
Restrictive practices are interventions that restrict a participant's rights or freedom of movement. There are five categories: physical (holding someone), mechanical (restraints like belts), chemical (medication used to manage behaviour), environmental (locked doors), and seclusion (involuntary confinement). Each must be: 1) authorised under state law before use, 2) included in a Behaviour Support Plan lodged with the NDIS Commission, 3) reported monthly to the Commission. Unauthorised use is a major breach and reportable incident. Each state has its own authorisation process — NSW, VIC and QLD have formal panels; others use clinical authorisation models.