Crime scene investigation or CSI has become a very popular subject thanks to the many films or television shows on this subject. This is commonly referred to as the CSI effect, where people have lost touch with the real work of CSI agents. On TV shows, cases are usually solved within hours or even days, when in reality it can take months or even years to solve a case. The primary goals of any crime scene investigator are to recognize, preserve, collect, interpret and reconstruct all relevant physical evidence at a crime scene. This evidence is sent to forensic laboratories to be examined and provide the investigator with information that may help solve the case. Later, this information can be used in court, which is why it is essential that the investigator gathers the evidence correctly and legally. Most police investigations begin at the scene of a crime, with the first responders to the crime scene usually being police officers, firefighters. personnel or emergency medical personnel. The actions of first responders at the crime scene can either aid the investigation or seriously harm it. The first responder must secure the area, assist any victims if applicable, arrest suspects if applicable, detain all witnesses, protect the crime scene, and provide information on any movements or changes to crime scene investigators or their supervisor. The crime scene must be secured by an officer designated to be the security guard. Its duty is to prevent unauthorized persons from entering the crime scene and to keep a record of all personnel entering or leaving the crime scene. In addition to this, there should be some sort of barrier such as a rope or yellow tape to inform people that an investigation...... middle of paper...... there n It's not unusual for a CSI agent or police officer to work over time. This series may have a lot of Hollywood fantasy about CSI agents, but it shows some truth. An investigator's work must be done correctly and legally. Follow all necessary steps to collect evidence and use their experience and expertise to solve the case. Investigators must be open-minded, well prepared and objective. Their only task should be to correctly gather all relevant information or facts from the crime scene. This job is not easy and not everyone can do it. The investigator will see what a man is capable of doing to another man, from rape to murder, suicide, work accidents and many other horrific scenes. This can have a profound impact on the investigator, so he or she must be physically and mentally prepared to meet the challenges of being a criminal investigator..