Yn dilyn hynny, cafwyd eglurder ar y sefyllfa gyfreithiol ynghylch rhoi’r gorau i roi maeth a hydradiad gyda chymorth clinigol drwy Benderfyniad y Goruchaf Lys ym mis Gorffennaf 2018. Dyfarnodd y llys na fydd angen cymeradwyaeth farnwrol bellach er mwyn rhoi'r gorau i driniaeth sy'n ymestyn bywyd unigolion ag anhwylder ymwybyddiaeth cyfnod estynedig, sy'n cynnwys cyflwr diymateb parhaol a chyflwr lled-anymwybodol, ar yr amod bod cytundeb ynghylch yr hyn sydd er budd y claf, bod darpariaethau Deddf Galluedd Meddyliol 2005 wedi'u dilyn a bod y canllawiau proffesiynol perthnasol wedi cael sylw.
Subsequently, the legal position regarding the withdrawal of clinically assisted nutrition and hydration (CANH) was clarified via a Supreme Court Decision in July 2018. The court ruled that judicial approval will no longer be required discontinuing life-prolonging treatment, for individuals with a prolonged disorder of consciousness (PDOC), which includes both a permanent vegetative state (PVS) and a minimally conscious state (MCS), provided that there is agreement upon what is in the best interests of the patient, the provisions of the Mental Capacity Act 2005 have been followed, and the relevant professional guidance has been observed.