THIS case commentary analyses the application of the best interests standard in section 4 of the Mental Capacity Act 2005 by the Court in the decision in Abertawe Bro Morgannwg University Local Health Board v RY (by his litigation friend the official solicitor) and CP [2017] EWCOP 2. It evaluates the way in which the law impacted on how clinical decisions in respect of RY were made and identifies systemic concerns arising from the case.