Blog #13

DNA changed the way we investigate crimes by giving us an idea of who the suspect is and concluding the case. By using the DNA found at the crime scene, we are able to narrow down who committed the crime. The two main types of tests are PCR and RFLP. PCR (polymerase chain reaction test) isn't very accurate but it is quick to process, usually a week. Also the DNA evidence doesn't have to be recent. It could be years after the crime and you are able to still use the DNA sample. RFLP (restriction fragment length polymorphism) is considered more accurate than PCR testing. It involves DNA fingerprinting or profiling and requires the DNA cells to be fresh, undamaged, and recently dead. Also, you would need large amounts of the samples, such as several strands of hair and large splatters of blood. Although this test is very conclusive and finalizing, it takes a long time to complete, about three weeks to three months.