The amount of DNA material needed to identify a perpetrator can vary depending on the quality and quantity of the sample collected. For example, a sample of blood or saliva may provide more DNA material than a sample of skin cells or sweat. In general, a small sample of DNA material, such as a few cells, can be sufficient for identification.
The time it takes to identify someone using DNA analysis depends on the complexity of the analysis and the availability of the necessary equipment and resources. For example, a simple DNA analysis, such as identifying a person based on a sample of their blood, may take a few days, while a more complex analysis, such as identifying a person based on a sample of their hair, may take longer.
The cost of DNA analysis can also vary depending on the complexity of the analysis and the availability of the necessary equipment and resources. In general, DNA analysis is more expensive than other forensic techniques, such as fingerprint analysis.
The reliability of DNA analysis is generally very high, especially when multiple samples are analyzed and compared to each other. However, the accuracy of DNA analysis can be affected by the quality of the sample collected and the conditions under which it was collected, as well as the accuracy of the analysis itself.