Is it legal for a husband to find a property to monitor an affair?

Legal analysis: Yes, there is usually a lot of evidence to prove an affair, and the evidence pays attention to documentary evidence and witness. Only witnesses are useless, and the other party can always find several people to say that they have never seen him cheating. Unless the other party admits it in court, or writes you a letter of guarantee to admit cheating and promise not to cheat.

Legal basis: Article 64 of the Civil Procedure Law of People's Republic of China (PRC), the parties have the responsibility to provide evidence of their own claims. The people's court shall investigate and collect evidence that the parties and their agents ad litem cannot collect on their own due to objective reasons, or evidence that the people's court considers necessary for hearing a case. The people's court shall comprehensively and objectively examine and verify the evidence in accordance with legal procedures.