Legal analysis: 1. When a lawyer meets with a criminal suspect or defendant in custody, the detention center shall check the lawyer's valid practice certificate, letter of introduction from the law firm, letter of authorization, or notice of designated defense by the people's court.
Secondly, when a lawyer meets with a criminal suspect or defendant in custody, there should be at least two people in order to supervise each other and ensure safety; at least one person when the lawyer meets is a practicing lawyer, and other accompanying persons who are not practicing lawyers should The applicant shall be in the same unit as the lawyer who meets with him, and shall hold certification documents issued by the lawyer management agency.
Legal basis: "Lawyers Law of the People's Republic of China" and "General Principles of the Civil Law of the People's Republic of China"
Article 165 If the agent is entrusted in written form, the power of attorney shall be State the principal's name, agency matters, authority and term, and be signed or sealed by the principal.
Article 919 An entrustment contract is a contract in which the principal and the trustee agree that the trustee will handle the principal's affairs.
Article 920 The principal may specifically entrust the trustee to handle one or several matters, or may generally entrust the trustee to handle all matters.