2) If he is found guilty, he must be sentenced. If not, the policeman who arrested him will be punished, and the public security department will ask the state for compensation.
3) After 37 days, you won't see anyone. After being detained in criminal detention, only hired lawyers or public security, prosecutors, judges (and of course the discipline of the detention center) can see me. Family members can't see others until the verdict.
4) If you really care about him, you can help him find a lawyer.
Supplementary legal provisions on the crime of fraud are as follows: Article 266 Whoever defrauds public or private property in a relatively large amount shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated.