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You have to wear the right p.p.e such as latex gloves when collecting DNA samples to prevent contamination by the collector. Larger items / too large or heavy to carry, or impossible to submit entirely may be swabbed or cut-out.(ex. bloodstained door). When collecting DNA samples with a swab you would want to use a clean cotton tipped swab (moistened with clean water if the stain is dry) this way it is able to be collected.

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For items that have apparent wet stains it is necessary to allow enough time for drying before packaging. This includes swabs collected from wet stains, allowing the stains to dry completely prevents contamination with other items, eliminates the creation of additional stain patterns, and helps prevent stain removal by abrasive action during packaging. Always use paper containers (bags, boxes, envelopes) when collecting DNA samples. Paper packaging is breathable and allows the item to dry completely. Do not use plastic or airtight containers for packaging. Packaging wet items in plastic creates conditions favorable for the growth of bacteria and mold and will have effects on the sample.

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Dried body fluids do not require refrigeration and should be stored at room temperature or cooler. You want to avoid storing DNA samples in direct sunlight or in temperatures above ambient room temperature for extended periods. Solid human tissue samples (including products of conception) need to be refrigerated and should be submitted to the lab as soon as possible.

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What are the steps for collecting DNA evidence?

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What are the steps for collecting DNA evidence?

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The DNA testing process is comprised of four main steps, including extraction, quantitation, amplification, and capillary electrophoresis. The way DNA is tested is a technique called the Polymerase Chain Reaction (PCR) allows an analyst to target specific areas on the DNA identified for forensic testing and make millions of copies of these areas. DNA profiles can then be generated and visualized using a technique that separates the DNA fragments based on their size.