Presumptive & Confirmatory Testing
What it is trying to solve?
Presumptive testing is used to screen items to determine the presence and location of possible stains. Whereas a confirmatory test will tell you if something is detected or not detected from a sample. The most common example is when you test a red substance to confirm if it is human blood or not. It is also used on stains to see if they contain semen.
Genetic Technologies also has experience working with quality assurance managers in product contamination incidents, examples of recent cases include;
| Red stain on bandaid in a canned food item. Did it belong to anyone on the production line? |
| A restaurant found red markings on a food item and wanted to know if it was blood or not. |
| Suspect stains found on clothing, including semen. |
For a complete breakdown of forensic services that Genetic Technologies can offer, please contact our customer service representatives.
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Features and benefits
The benefits of using Genetic Technologies forensic testing service include;
| Independent testing of samples, with testing conducted to the highest possible standards. |
| A proven track record of quality results. |
| Many years experience in forensic testing using cutting edge technology. |
| Highly qualified staff with experience in all aspects of biological and DNA forensic testing |
| Rapid turnaround times |
Case Study
A metal object (needle) was discovered in a manufacturer's product (bar of soap). The needle had apparent red and brown coloured markings. The manufacturer sent the item to our laboratory for testing to determine if the markings were blood. The results of forensic testing showed that the sample was not blood.
A band-aid was located in a canned food product by a consumer and the manufacturer sent the sample to our laboratory to determine if the red staining found on the band-aid was blood. Human blood was detected from the stain and a DNA profile obtained. This profile matched the DNA profile of reference sample given voluntarily by a plant worker.
Sample types
A variety of samples types can be used for forensic testing. These may include, but are not limited to:
| Blood |
| Saliva |
| Semen stains |
| Hair |
| Faeces |
| Clothing |
| Tissue/skin cells |
| Condoms |
| Cigarette butts |
| Latex gloves |
| Production equipment |
| Envelopes |
| Trace swabs - such as when people drink from cups or cans, or touch door handles. |
* It is important to note that a result cannot always be guaranteed and is dependent upon the quality (age, condition) of the sample and/or the amount of available DNA in a sample.
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