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The purpose of this research is to analyse the causal factors and efforts to overcome murder cases in Danga Village, Aesesa District, Nagekeo Regency. This type of research is empirical juridical, the approach that the author uses in this research is a qualitative approach. The location of this research is the Nagekeo Resort Police Office. The subjects used as researchers in this study are police officers. The data collection techniques used in this study are interviews, documentation. This research uses a type of qualitative research that produces descriptive data. The results of this study are the criminal act of premeditated murder in the case occurred due to several causative factors, such as unstable emotions, alcoholic beverages, economic factors, low levels of education, revenge factors. The existence of the application of the death penalty Article 340 of the Criminal Code against the perpetrators of the criminal act of premeditated murder which has a very serious capacity and is carried out cruelly, sadistically and truly violates the highest values of humanity. The countermeasures taken against the disclosure of murder cases are Preemtif efforts, namely socialisation, to prevent more severe crimes, the security forces conduct socialisation to the people throughout Indonesia. Furthermore, Repressive efforts are crime scene processing, the authenticity of the place that occurred at the scene of the crime. Finally, the Preventive effort is that the security forces stop the perpetrator's actions so that his behaviour is not repeated again so as not to harm many people or himself.

Juvenile delinquency in Kupang City is very diverse, one of which is illegal racing. Teenagers who indulge in this behaviour do not care about the safety and security of themselves or other road users. The purpose of this research is to analyse the juridical sociology review of illegal racing cases in Kupang City. This type of research is empirical juridical research. The type and source of data used are primary data, namely data obtained directly from the research location through direct interviews with respondents. The data is analysed descriptively qualitative. The results of this study indicate that the factors that cause a lot of illegal racing in Kupang City are sociological factors consisting of environmental factors and betting factors. Psychological factors consisting of adolescent personality factors and hobby factors. Efforts made by investigators against the perpetrators of illegal racing in Kupang City are carried out in two ways, namely, preventive efforts and repressive efforts. It is hoped that teenagers have legal awareness and it is hoped that police officers, especially traffic police, will be more assertive in sanctioning teenagers who often commit traffic violations, especially illegal racing violations, so that there is a deterrent effect for the perpetrators.