The work in biology division includes analysis of various exhibits such as blood, semen, saliva & other body fluids, hair, tissues, skeletal parts for their identification / comparison -

• Determination of the "origin and grouping" of biological stains
• Analysis of blood, semen, saliva and other body fluids, tissues and their stains
• Interpretation of the pattern of blood stains
• Identification and comparison of hair
• Determination of cell structure and their significance
• Personal identification by super imposition of suspected skull with ante-mortem photographs of the deceased

• Copy of P.M. report (injury report / medical examination report of the victim / medical examination report of the accused person)
• Blood and blood stains: Following instructions must be followed while collecting blood stained articles. Fresh and moist stains on clothing, sheets, blankets etc. should be spread out and thoroughly dried at room temperature
• The stained portions should be separated by clean sheets of white paper to protect the stain from contamination with the rest of the exhibit.
• If blood is found in large quantities, the excess may be soaked in a filter paper or a clean white cloth. The sample should be dried in shade (not in sun) at room temperature, but avoiding artificial heating. An unstained portion of filter paper or cloth should be sent separately as a control sample. The control sample should be collected and packed before collecting the blood stained sample to avoid contamination
• In case the article is big in size, unstained portion (as control) and stained portion (sample of interest) may be cut after proper documentation
• The same procedure may be adopted for fresh moist stains on solid objects such as weapons, wood, plaster, automobile etc
• Dried stain on clothing's sheets, blankets etc should be sent as it is, separating the stained and unstained portions with clean white paper.
• In the case of dried blood stain on solid objects, the entire object should be sent to the laboratory. if it is not possible, scrape off the stain, as much as possible, avoiding scraping the solid object underneath, and placed the scrapping in a clean test tubes or take the swab in cotton wool / sterile gauge.
• If the blood is found on earth, it should be scooped deep enough, to ensure collection of the soaked serum.
• The blood and blood stains on the body of the person should be removed with the help of a piece of filter paper, cotton, or a clean piece of cloth, moistened with normal saline. The stain thus obtained should then be dried in shade and packed in a suitable container
• Blood sticking to the nail should be removed carefully by clipping the nails
• For determining the blood group it is necessary to send a control specimen. A portion of unstained area of the stain should also be sent as a control to the laboratory
• Semen and Saliva: The stain should be allowed to dry at room temperature. The entire object should be sent to the laboratory. Care should be taken to see that the stained areas are not folded. The control samples of saliva should be collected on separate sterile clean piece of cloth / gauge or cotton wool from the victim and suspected persons.