The behaviors that lawyers can engage in according to law in the investigation stage are

Legal analysis: The investigation stage is the beginning of the case, at which time the suspect has been detained and lost his personal freedom. Lawyers can do these things in the investigation stage: 1, which can provide legal help to criminal suspects; Acting as an agent for complaints and accusations; Apply for changing compulsory measures; Have the right to ask the investigation organ about the suspect's suspected crime and the situation related to the case, and put forward opinions. 2. The right to meet and correspond with criminal suspects and defendants in custody.

Legal basis: Criminal Procedure Law of People's Republic of China (PRC).

Article 38 A defense lawyer may provide legal aid to a criminal suspect during investigation. Acting as an agent for complaints and accusations; Apply for changing compulsory measures; Ask the investigation organ about the crimes and cases suspected by the criminal suspect, and put forward opinions.

Article 41 Defenders who believe that the evidence materials collected by public security organs and people's procuratorates to prove the innocence or minor crimes of criminal suspects and defendants have not been submitted have the right to apply to the people's procuratorates and people's courts for retrieval.