The document discusses the use of DNA technology in criminal investigations in Tanzania. It outlines how biological samples from crime scenes and suspects are collected and analyzed to generate DNA profiles, which are then compared to link suspects to crimes. The responsibilities of crime scene investigators in properly collecting, packaging, storing, transporting and submitting DNA evidence samples are also explained, as these steps are critical to obtaining high quality samples and avoiding contamination. Guidelines for investigators emphasize careful handling and labeling of all biological material.

1. THE USE OF DNA TECHNOLOGY IN CRIMINAL INVESTIGATION IN TANZANIA. BY G. MACHUVE FORENSIC DNA UNIT GCLA

4. EVIDENCE SAMPLES AT CRIME SCENE LIKELY TO CONTAIN DNA Saliva Edge of toothpicks, depris in toothbrushes Toothpicks, toothbrush 4 Sweat, skin Nose bridge & earlobe Spectacles/glasses 3 Sweat, hair, dandruff Inner lining A cap 2 Sweat,blood & skin Handles and blades of knives Knives, 1 Source of DNA Place where DNA can be found Exhibit S/N

5. Cont.. Sweat & blood Handles, trigger and burrel Guns, 8 saliva Saliva on envelope seal Stamps, envelopes 7 Blood, semen, sweat, dandruff, hair underpants, shirts, trousers, dresses, sheets, socks, Clothes 9 Saliva, sweat Rims and edges of bottles, cans, bowls, cups Bottle, glass, cans, bowls, cups 6 Saliva Cigarette butts, cigar pipes’ mouth piece Cigarette, cigar pipes 5

6. Cont… Feaces, urine Toilet bowls, seats and floor Toilets 13 Blood & tissues Kidney, liver, intestines, bones Body parts 12 Sweat, blood, hair, fingerprints & saliva Car seats, seat belts, steering wheel, tires, window glass, door knobs, buttons, rear mirrors etc… Vehicles 11 Sweat & blood Foot wear, socks Foot wear 10

25. DNA Analysis Reports released 2005/2006 - - 59 Rape 27 73 159 Murder 60 40 250 Paternity Exclusive (%) Inclusive (%) No. of samples analyzed Types of cases

26. DNA Analysis Reports released 2005/2006 cont… 2 Male 1 3 Sex identification Female No. of samples analyzed