The Mental Capacity Act aims to protect vulnerable individuals to maintain their right to dignity and safety and is based on five principles:
Nod y Ddeddf Galluedd Meddyliol yw amddiffyn unigolyn sy'n agored i niwed, i gadw eu hawl i urddas a diogelwch ac mae'n seiliedig ar bum egwyddor:
Under the Act it is a criminal offence to wilfully neglect or ill-treat an adult lacking mental capacity to make a required decision - MCA Section 44(2).
O dan y Ddeddf, mae'n drosedd i esgeuluso neu gam-drin oedolyn sydd heb allu meddyliol i wneud penderfyniad gofynnol - Adran 44 (2) MCA.