Legal and Ethics Considerations in Capacity Evaluation for Medical Aid in Dying.

Evaluating decisional capacity for patients seeking medical aid in dying (MAID) raises challenging legal, logistical, and ethics questions. The existing literature on the subject has been shaped largely by early disagreements over whether effective capacity assessment for such patients is ever possible, which in turn stemmed from debates over the ethics of MAID itself. In attempting to establish meaningful criteria for assessments, many jurisdictions have sought either to apply or to adapt models of capacity evaluation designed for other forms of medical decision-making, such as the widely used "four skills" model, failing to account for the fundamental differences in kind between these other decisions and MAID. This article seeks to reexamine these questions with a focus on two logistical matters (the appropriate credentialing for the evaluator and the potential liability of the evaluator) and three clinical matters (level of understanding, clinical scrutiny and certainty, and impairment) in an effort to raise legal and ethics concerns that remain unresolved, even as MAID is permitted in an increasing number of jurisdictions.