PART III. – BASIC PRINCIPLES OF GOVERNMENT.
Division 3. – Basic Rights.
Subdivision B. – Fundamental Rights.
37. PROTECTION OF THE LAW.
(4) A person charged with an offence–
(a) shall be presumed innocent until proved guilty according to law, but a law may place upon a person charged with an offence the burden of proving particular facts which are, or would be, peculiarly within his knowledge ;
Presumption of innocence
Rights during trial - burden of proof
EDIT.