Legal basis:
Article 15 of the Criminal Procedure Law shall not be investigated for criminal responsibility under any of the following circumstances. If the investigation has been concluded, the case shall be dismissed, or no prosecution shall be instituted, or the trial shall be terminated, or the case shall be declared innocent:
(a) if the circumstances are obviously minor and the harm is not great, it is not considered a crime;
(two) the crime has passed the limitation period;
(3) Being exempted from punishment by an amnesty order;
(4) Failing to tell or withdrawing a crime that should be dealt with only after being told according to the Criminal Law;
(5) The criminal suspect or defendant dies;
(six) other laws and regulations shall be exempted from criminal responsibility.
Article 31 of the Lawyers Law: When a lawyer acts as a defender, he shall, according to facts and laws, present materials and opinions on whether a criminal suspect or defendant is innocent or light, or on reducing or exempting his criminal responsibility, so as to safeguard the legitimate rights and interests of the criminal suspect or defendant.
Article 34 An entrusted lawyer shall have the right to consult, extract and copy the litigation documents and files related to the case from the date when the case is examined and prosecuted. The entrusted lawyer has the right to consult, extract and copy all materials related to the case from the date when the people's court accepts the case.
Article 35 An entrusted lawyer may, according to the needs of a case, apply to a people's procuratorate or a people's court to collect and obtain evidence, or apply to a people's court to notify witnesses to testify in court.
If a lawyer investigates and collects evidence by himself, he may, with the lawyer's practice certificate and the certificate of the law firm, investigate the situation related to undertaking legal affairs with the relevant units or individuals.