What is it to open a room first and then bring someone in?

No, you must use your ID card to open a hotel room. Now all regular hotels are connected to the public security bureau, and everyone who stays in a hotel room must show his/her ID card, otherwise he/she will not stay.

According to Article 6 of the Measures for the Administration of Public Security in Hotel Industry:

Hotels must register when they receive passengers. At the time of registration, the passenger's identity documents shall be checked and truthfully registered according to the prescribed items. To receive accommodation from overseas tourists, an accommodation registration form shall also be submitted to the local public security organ within 24 hours.

Extended data:

Measures for the administration of public security in hotel industry

Article 14 Public security organs shall be responsible for the public security management of hotels, guide and supervise hotels to establish various safety management systems and implement safety protection measures, assist hotels to train employees in safety knowledge, and punish criminals who infringe upon the legitimate rights and interests of hotels and tourists according to law.

When performing official duties in hotels, public security personnel should show their certificates, act in strict accordance with the law, treat people with civility and courtesy, and safeguard the normal operation of hotels and the legitimate rights and interests of passengers. Hotel staff and tourists should provide assistance.

Fifteenth in violation of the provisions of article fourth of these measures, the public security organ may give a warning or a fine of two hundred yuan; Without registration, the public security organ shall assist the administrative department for industry and commerce to deal with it according to law.

Sixteenth hotel staff in violation of the provisions of article ninth of these measures, the public security organ may give a warning or impose a fine of 200 yuan; If the circumstances are serious enough to constitute a crime, criminal responsibility shall be investigated according to law.

The person in charge of the hotel participates in illegal and criminal activities, and the hotel management becomes a criminal website. In addition to investigating the responsibility of the responsible person, the public security organ will deal with the hotel in conjunction with the administrative department for industry and commerce according to law.

Central People's Government-Measures for the Administration of Public Security in Hotel Industry