‘(3) A person is not to be treated as unable to make a decision unless all practicable steps to help him do so have been taken without success. (4) A person is not to be treated as unable to make a decision merely because he makes an unwise decision.’
‘s 5 (1) If a person (“D”) does an act in connection with the care or treatment of another person (“P”), the act is one to which this section applies if—(a)before doing the act, D takes reasonable steps to establish whether P lacks capacity in relation to the matter in question, and (b)when doing the act, D reasonably believes—(i)that P lacks capacity in relation to the matter, and (ii)that it will be in P's best interests for the act to be done. (2)D does not incur any liability in relation to the act that he would not have incurred if P— (a)had had capacity to consent in relation to the matter, and (b)had consented to D's doing the act…’ ‘s6 (1)If D does an act that is intended to restrain P, it is not an act to which section 5 applies unless two further conditions are satisfied. (2)The first condition is that D reasonably believes that it is necessary to do the act in order to prevent harm to P. (3)The second is that the act is a proportionate response to— (a)the likelihood of P's suffering harm, and (b)the seriousness of that harm. (4)For the purposes of this section D restrains P if he— (a)uses, or threatens to use, force to secure the doing of an act which P resists, or (b)restricts P's liberty of movement, whether or not P resists…’
“78. The second question looks to whether there is a clear causative nexus between P’s inability to make a decision for himself in relation to the matter and an impairment of, or a disturbance in the functioning of, P’s mind or brain.” 44. In relation to the first question, the functional test, Lord Stephens said at [68] that as the assessment of capacity is decision specific, “the court is required to identify the correct formulation of “the matter” in respect of which it must evaluate whether P is unable to make a decision for himself.”
“The correct formulation of “the matter” then leads to a requirement to identify “the information relevant to the decision” under section 3(1)(a) which includes information about the reasonably foreseeable consequences of deciding one way or another or of failing to make the decision: see section 3(4).” 45. Lord Stephens said at [76] that, once the information relevant to the decision had been identified, then: “P is unable to make a decision for himself in relation to the matter (section 2(1)) if, for instance, he is unable to understand the information (section 3(1)(a)) or to use or weigh that information as part of the process of making the decision (section 3(1)(c)).”
“38. It is important to note that s3(1)(c) is engaged where a person is unable to use and weigh the relevant information as part of the process of making the decision. What is required is that the person is able to employ the relevant information in the decision making process and determine what weight to give it relative to other information required to make the decision. Where a court is satisfied that a person is able to use and weigh the relevant information, the weight to be attached to that information in the decision making process is a matter for the decision maker. …If P is unable to make the decision his or herself in relation to the matter then the court moves to the second question namely whether the inability is “because of” an impairment of, or a disturbance in the functioning of, P’s mind or brain.”