With the case acceptance notice, the lawyer can retrieve the other party’s personal household registration information. Lawyers have the right to investigate and collect evidence on their own, and only need "two pieces of evidence." When meeting with a criminal suspect or defendant, you must have the "three certificates" (lawyer practicing certificate, law firm certificate, power of attorney or legal aid letter). However, although the law has clear provisions, it is generally difficult for lawyers to obtain evidence on their own, and defendants are often unwilling to cooperate.