Why hasn't the police investigated the disappearance of female college students?

The police have been tracking and investigating the disappearance of female college students, and so far no results have been achieved. I think one thing is that female college students have not left some obvious evidence for the police to find. China is such a big territory that the police do not have such manpower and material resources to visit and investigate every place. Twenty-four hours after the girl's disappearance, her family immediately reported to the local police station. The police also organized relevant personnel to trace the girl's transportation, visit the passengers on the train and the hotel where she might stay, but they didn't find the girl's whereabouts. The police also tried their best to investigate the matter and announced it to the outside world, hoping that the insider could provide useful information and contact the police in time. So the police have been looking for the girl's trace until now.

The girl may have done it on purpose in this incident. According to the girl's counselor, the girl is a senior student, and her grades at school are not very satisfactory. She has always been depressed, so she wants to go outside for fun. However, during the investigation, the police found that only the information about his transportation can be found, but no hotel information can be found. Now all hotels must provide ID information. If there is no information about accommodation, where will the girl rest?

Girls must not travel alone. The news has reported many cases of missing girls, so girls must go out together. Don't talk to strangers easily. If you meet food and water handed by strangers, don't accept it easily. If you find something wrong, it is a very happy thing to call the local police immediately and go out to play. But it is more important to pay attention to safety. It is never as safe and peaceful as we think, and you should always be vigilant.