is adding more polices reduce the high crime rates

Only by adding more police officers may reduce the high crime rate. With more police on patrol, criminals cannot engage in illegal activity since it is too rash and can be easily caught. In some cases when the offender is committing criminal behavior, the police could arrive on time and with a large number of cops, the perpetrator would be apprehended and the victims are saved. Moreover, it is important that the police could be a witness to the crime while on patrol or conducting the investigation, this helps to arrest the unpunished and prevent wrongful convictions. However, the quantity must go with the quality. More police officers in some cities do not seem to lower the crime rate here because some police are incapable. Having to add more police to the system in a short time may lead to poor quality of training, so that many police are not properly trained, they do not have enough ability to protect the residents and fight against the criminals. Or even worse, some police can take advantage of their jobs to bully the weak and commit criminal behavior. Take the death of George Floyd as an example, this poor man was killed in police custody, just because he was black.