Code of Professional Responsibility and Accountability (CPRA)
Section 31. Prosecution of criminal cases. - The primary duty of a public prosecutor is not to convict but to see that justice is done. Suppressing facts, concealing of, tampering with or destroying evidence, coaching a witness, or offering false testimony is cause for disciplinary action. The obligations of a public prosecutor shall also be imposed upon lawyers in the private practice who are authorized to prosecute under the direct supervision and control of the public prosecutor.