Factors of a case to be unsolved

There are a few factors that causes a case to be unsolved. One of the factor is not having enough evidence or proof for that specific case which will cause to a dead end. Other than that, lack of public cooperation is also a factor as they did not give any information regarding the case. Besides, suspect that had been targeted may have disappeared and no where to be found is another reason why a case cannot be solved. Tunnel vision is another factor. Tunnel vision is when investigators point of view towards a suspect have been overlook or ignored due to unclear evidence which may result to be proven as innocent. Therefore, there will be a tendency that the investigators would target another possible suspect based on his or her past records such as juvenile records or criminal records. The last factor would be the DNA or fingerprint found during the investigation cannot be detected or match with anyone that could be related or not related to the victim. In other words, it could lead to a dead end or mysterious crime.