Forensic DNA analysis uses DNA evidence found at crime scenes to help solve legal cases. DNA can be obtained from bodily fluids like blood, semen, saliva, and skin cells left on various surfaces and objects at a crime scene. Common sources of DNA evidence include clothing, tools, weapons, sexual assault kits, undergarments, bedding, and items touched with bare hands. The accuracy of DNA analysis makes it a valuable tool for identifying suspects but also for exonerating innocent individuals wrongly convicted of crimes.

1. Forensic DNA
Analysis
Catipay, Mary Lorraine

2. Introduction
• Forensic DNA Analysis is the use of
deoxyribonucleic acid (DNA) specimens in legal
proceedings. Just as people can leave fingerprints
when they touch a surface, so too can they leave
biological material that contains DNA.
• Because of the accuracy and reliability of forensic
DNA analysis, this evidence has also become an
invaluable tool for releasing individuals who have
been wrongfully convicted.

3. Types of cases:

4. Sources of DNA Evidence
• blood
• semen
• saliva
• urine
• feces
• hair
• teeth
• bone
• tissue
• cells

5. Samples that May be Used
• Masks
• Hats
• Gloves
• Clothing
• Tools
• Weapons
• Sexual assault evidence kits
• Underclothes
• Bedding
• Dirty laundry
• Fingernail scrapings
• Cups/bottles
• Cigarettes
• Toothpicks
• Toothbrush
• Facial tissue
• Hairbrush
• Eyeglasses
• Condoms
• Tape
• Ligatures (rope, wire, cords)
• Stamps or envelopes

6. Sources
• http://www.forensicsciencesimplified.org/dna
/
• http://www.biologyreference.com/Fo-
Gr/Forensic-DNA-Analysis.html