There is no evidence that smuggling lawyers can ask the detention center to release people?

No, lawyers can't directly ask the detention center to release people. Even if there is no evidence to prove it, we can only see whether it meets the conditions of bail pending trial according to the specific case. If you meet the conditions, you should apply for bail pending trial, rather than directly asking for release, which is not in line with legal procedures. After the criminal suspect is taken compulsory measures, his close relatives and lawyers may apply to the case-handling organ for bail pending trial.