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Blood at a crime scene is often indicative of some form of physical struggle, assault, or even murder. Blood has the potential to be analysed and used in the identification and incrimination of the perpetrator. To examine this can not only provide clues as to the identity of the offender, but also help investigators develop a detailed picture of the sequence of events which occurred. Because some bloodstains are difficult to identify with the naked eye, initially presumptive tests like leucomalachite green(LMG) or luminol test are essential to confirm its identity. However, not all biological sample may contain sufficient DNA to obtain a DNA profile. Collection, packaging, storage and transportation of samples are very important not to mention the contamination between a crime scene and a laboratory. In this study, three successful cases in which bloodstain played an important role were reported.