Health professionals are in an ethical dilemma. The patients should be assumed as competent. Involuntary treatment is a violation of human rights. Therefore incompetent patients should be protected. However, one cannot determine a patient's incompetency without testing him/her, which is a violation of the assumption of competency. Thus, we propose two different types of uses for competency tests. One is to measure the appropriateness of information disclosed,but with a poor test result the information should be repeated. Another is to measure the competency of the patients when making major decisions. A poor test result will be followed by the designation of a proxy so that incompetent patients can be protected.