What process is used to collect DNA for CSI?

What process is used to collect DNA for CSI?

From a human being, DNA is collected either through a blood sample or through a mucal swab, that is swabbing the inner portion of the cheek with a cotton swab. As far as evidence at crime scenes, any blood stain or any semen stain is certainly a candidate for DNA analysis. There are other things that may contain DNA that may not be as apparent, such as a cup that has become in contact with saliva, or a cigarette butt that has come in contact with saliva. There are lots of what we call carriers of DNA that may not be very apparent to the investigator at the crime scene, and that's why a thorough collection of these items must be made and brought back to the lab for further investigation and analysis for DNA.