1. Inquiring about household registration: Check whether there are multiple marriage registration records by inquiring about this person's household registration information.
2. Inquire about the civil affairs department: You can go to the local civil affairs department to inquire about the person's marriage and whether there are records of multiple marriages.
3. Check the records of the public security system: Check whether the person has any records of suspected bigamy through the public security system.
4. Private investigation company: You can entrust a private investigation company to conduct an investigation, but you should pay attention to choosing a formal and legal institution.
How to identify the crime of bigamy;
Bigamy refers to the illegal act of a spouse marrying another person, that is, a person has more than two kinds of marriage relationships at the same time. The key to determining the crime of bigamy depends on whether it constitutes another relationship between husband and wife. According to the relevant judicial interpretation, there are two cases of bigamy: one is legal bigamy, that is, people with spouses register for marriage with others; Second, in fact bigamy, that is, people with spouses live together with others in the name of husband and wife.
Husband and wife are commensurate, except for the recognition between the parties and the appellation in daily life. The parties live together. When the woman is sick, the man signs her husband's name and accompanies her. The woman gives birth to a child, the man signs in the hospital in the name of his father, and the parties celebrate the full moon for the child in the name of their parents. , can also be used as auxiliary evidence that husband and wife are commensurate. To determine the crime of bigamy, it is usually necessary to obtain the testimony of the surrounding people and relatives and friends of the parties to prove that the surrounding people think that the parties are husband and wife.
Reference to the above content: Baidu Encyclopedia-Criminal Law