2. If the suspect has evidence to prove that he may be involved in the case during his detention, the public security organ may arrest him. The time of arrest is unknown, as long as seven months. From the perspective of the current procedural law, the public security organs may even take advantage of the procedural law and detain them for a long time. Therefore, there is actually no absolute time for arrest.
If your friend is really suspected and there is not enough evidence to prove his innocence, it is better to find a lawyer as soon as possible to understand the case. During criminal detention, family members can't see the suspect, only lawyers can. However, this is only possible. Although there are provisions in the procedural law, public security personnel often deliberately make things difficult for lawyers to meet suspects in judicial practice.
It has no practical significance to pester public security personnel about whether the criminal detention or arrest procedure is legal, but it will arouse public security personnel's disgust and hostility, which will not help your friends. China is not a real country ruled by law, and minor procedural violations will not affect the execution and coercive power of public security organs.
5. It is very common for public security personnel to induce confessions of suspects during preliminary examination, and it is also possible to extort confessions by torture. After all, the detention center is not a prison (prison system), but belongs to the public security organs. It is very convenient for public security organs to extort confessions by torture when interrogating criminal suspects in detention centers under their jurisdiction, and there is no restriction on their supervision.
6. Murder detection is a political pressure and achievement requirement for the leaders of public security organs. Therefore, it is necessary to hire a lawyer. At least a good lawyer can help the suspect to establish a good relationship and avoid or reduce the confession of the public security organs.