Final answer:
A client can refuse treatment even if their life is in danger and does not need to prove intelligence or sign the consent form with a proper signature.
Step-by-step explanation:
When giving consent for treatment, a client does not have to prove intelligence or sign the consent form with a proper signature. However, a client does have the right to refuse treatment even if their life is in danger. In certain circumstances, parents can provide consent on behalf of their children if they are not competent to provide consent for themselves.