It is quite necessary, because lawyers are experts in law and can effectively safeguard the legitimate rights of the parties. But at this stage, the effective participation of lawyers is not sufficient. The reasons include unclear lawyer's role, imperfect system environment, difficult lawyer's defense and increased agency risk. In the future development, it is necessary to introduce strict rules to implement lawyers' participation and require lawyers to improve their coping ability. It takes two to three months for general criminal cases to be transferred from criminal detention to procuratorate. The public security organ may impose criminal detention on an active criminal or a major suspect. Detainees should be questioned within 24 hours after detention. If the public security organ deems it necessary to arrest the detained person, it shall submit it to the people's procuratorate for examination and approval within three days after detention. Under special circumstances, the approval time can be extended by one to four days. For major suspects who commit crimes on the run, commit crimes many times or commit crimes in collusion, the time for submitting for examination and approval may be extended to 30 days. The people's procuratorate shall, within seven days after receiving the approval letter from the public security organ, make a decision on whether to approve or disapprove the arrest. If the people's procuratorate does not approve the arrest, the public security organ shall immediately release it after receiving the notice and promptly notify the people's procuratorate to execute it.
Article 36 of the Criminal Procedure Law of People's Republic of China (PRC) stipulates that from the date when the people's procuratorate examines and prosecutes a case, the defense lawyer may consult, extract and copy the litigation documents and technical appraisal materials of the case, and may meet and correspond with the criminal suspect in custody. Other defenders, with the permission of the People's Procuratorate, may also consult, extract and copy the above-mentioned materials, and meet and correspond with criminal suspects in custody. Since the people's court accepted the case, the defense lawyer can consult, extract and copy the materials of the alleged criminal facts in this case, and can meet and correspond with the defendant in custody. With the permission of the people's court, other defenders may also consult, extract and copy the above materials, and meet and correspond with the defendant in custody.