This is the second article in a two-part series that establishes a framework for evaluating law as it affects the rights to liberty and security for people with intellectual and cognitive impairments. This article uses the rights-based approach developed in the first article to establish a methodology to evaluate the range of ways in which law can be made or interpreted in this area. The methodology considers the adjudication of common law rights by courts, judicial interpretation of statute and the making of laws. Key areas of law considered are those that permit the detention and use of restrictive practices for ‘challenging behaviours’ or ‘behaviours of concern’. The article concludes by arguing that a rights-based approach and a method to assess how law applies it is essential to ensure that a ‘thick’ rule of law can protect and promote the rights and interests of people with intellectual and cognitive impairments.