四、公民参加勘查和搜查案件现场是最重要的证据的来源。通常,最先在现场的都是公民:受害人,目睹人,发现犯罪后果(尸体、撬门、火灾、物质财富丢失、售货员骗人等等)的人。民警人员和侦查员赶到现场,只是在得到实施犯罪行为的消息之后。因此,公民在发现犯罪行为最初时刻的态度如何,是否采取必要的措施,在很大程度上决定着侦查工作的成败,而有些时候甚至关系到对犯罪行为的侦查是否可能。发现犯罪行为的人的首要任务,就是刻不容缓地向民警局报告和帮助受害人,采取措施保护现场。对受害者的最大帮助,如果没有发现尸体僵硬或腐烂等真正死亡的特征,就要找人急救或用任何方法可以弄到的运输工具把他送到最近的医院或医疗站。为了保护现场,应该在进出口布置岗哨,防止局外人进入现 Fourth, citizens participate in the scene of investigation and search of the case is the most important source of evidence. Often the first citizens on the scene were the victims: those who witnessed them, those who found the consequences of the crime (bodies, breaking doors, fire, loss of material possessions, salesman fraud, etc.). Civilian police and investigators rushed to the scene only after receiving the news of the commission of the criminal act. Therefore, whether citizens take the necessary measures when they discover the initial moment of the criminal act will largely determine the success or failure of the investigation work, and sometimes it is even possible to investigate the criminal activities. The primary task of those who detect criminal acts is to urgently report and help the victims to the police station and take steps to protect the scene. The greatest help to the victims, if no real signs of death, such as stiffness or decay, are found, then they must be sent to the nearest hospital or medical station by first aid or by any means available. In order to protect the site, posts should be arranged at the import and export to prevent outsiders from entering the present