Hello, according to the information you provided, legal provisions and my defense experience, I think your friend was criminally detained on suspicion of stirring up trouble. It's almost a month now, and it should have been or will be transferred to arrest. Criminal detention is the beginning of investigating criminal responsibility. 37 days is the longest period of criminal detention. In the meantime, it will turn into arrest. Then there is a long detention, waiting for the court to try until the court makes an effective judgment. How to deal with it in the end, the court will make a final judgment after hearing it.
Currently facing criminal responsibility and sentence. The specific result depends on the specific case and the lawyer's defense. It is of great significance. It is suggested that professional criminal defense lawyers be hired as soon as possible to provide legal help and defense. Through Baidu hi plus "Beijing Du Lawyer", you can further contact for consultation. ? Good luck.
The detention permit you mentioned was issued within 48 hours after detention. You can ask the local police station. However, in practice, due to various reasons, family members often fail to receive detention notices.