It is most beneficial to protect their legitimate rights and interests to ask lawyers to intervene as soon as they are detained. Criminal detention refers to temporary compulsory measures taken by public security organs or people's procuratorates against active criminals or major suspects in the investigation of criminal cases. The public security organ shall interrogate the detained person within 24 hours after detention. If the detainee is approved for arrest, he will be tried according to the Criminal Procedure Law, and criminal detention is not a punishment or sanction. If later acquitted, the detainee can apply for state compensation. If you are under criminal detention or arrest, only a lawyer can see you. According to the existing law, family members or friends can't meet criminal suspects, only when they attend court meetings. During this period, only lawyers are entrusted to enter the detention center to meet with criminal suspects or defendants. Lawyers can enter the detention center to learn the following information: whether they have been tortured to extract confessions, bullied or abused by fellow prisoners, provide them with legal advice and help, understand the charges and cases involved, feed back their worries and hopes to their family and friends, and their situation inside, get bail on their behalf, appeal or accuse on their behalf, and so on.