According to our investigation, criminals often take advantage of their mistakes and choose places that are easy to start and hard to be found for burglary. If they are found in the process of theft, they may commit robbery, rape and even murder. There are two times of the day when they commit the crime: three or four o'clock in the morning and working time in the daytime. Black recruit one: downpipe gas pipe as ladder. At present, many downpipe gas pipes in urban houses are installed outdoors and close to balcony windows. Criminals are easy to climb into houses and commit crimes with the help of downpipe gas pipes. Black trick 2: climb the anti-theft net like walking on the ground. The security net of every house is a city scene, but it can't be used in the installation of irregular security net. Thieves often use the protruding security net to climb up and down to commit crimes. There are two kinds of theft cases happened in the later half of the night: one is to break the anti-theft net to enter the room and steal; the other is to use the anti-theft net to climb up and drill into the high-rise households to commit crimes. Nonstandard installation can not only protect itself, but also harm the neighbors. Instead of anti-theft, the anti-theft network helps to steal. Black trick 3: enter the house while you are not crowing. This is the usual means for criminals to commit crimes in the daytime. The early anti-theft door only had a few screws to fix the door frame. In fact, it couldn't stand the force of crowbar at all. It was done in one minute. Recently, the structure and strength of anti-theft door have been greatly improved, but with the birth of micro gas cutting tools, many cases of burglary have been found in China. Black trick 4: rope on the roof & quot; swing & quot;. This way of committing crimes is relatively hidden, because everyone thinks that no one dares to commit crimes from the top to the bottom of the roof, so there is no prevention and inspection of the roof roof, and the safer the place, the less safe it is. Black move five: tricky words deceive you to open the door. In many cities, gangsters are found to rush to residential buildings, pull off the electric switch installed outside the houses, and then rush into the houses to rob by taking the opportunity of opening the door for inspection. In addition, some gangsters use the opportunity of the owner's advertisement to rent the house, pretending to visit the house and rob it. Others pretended to be water and electricity repairmen and cheated the door. Black move six: Unlock the lock. As far as we know, many cities have found that criminals have mastered the unlocking technology and enter the house to steal. For example, a criminal named Ling Weiquan in Guangzhou calls himself 'the king of Guangzhou lock'. With his own key, he can open all kinds of locks in a very short time. In one year, the gang has stolen more than 200 houses and obtained more than 10 million yuan worth of property. Black move seven: self made board hand pry iron window. Nowadays, the anti-theft net is mostly welded with steel bar or square slot iron, with slightly sparse density, which just provides a good grip for the wrench. In addition, the welding spots are only a little bit, which can't stand a pull. In recent years, it is found that the thief has made some fork tools like spanner, which can pull out a large gap or hole in the anti-theft net within 2 minutes, and then drill into the room to steal. Black trick eight: tailgating robbery. In recent years, with the strengthening of people's preventive measures against the living room, the criminals are not easy to enter the room and take extreme measures. So usually pay more attention to the following people who enter the elevator stairs together, which can avoid disasters. Black recruit nine: criminals also defend themselves;. Criminals enter the room at night mostly through the kitchen windows, often stealing kitchen knives in their hands. Its main purpose is to give oneself courage and self-defense, but this has caused great hidden danger to the personal safety of the residents. Once the residents are awake or found when the criminals commit the crime, the criminals are easy to go to extremes and cause casualties of the residents.