Testing Process
 
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Forensic Testing Process

DDC complies with strict forensic standards throughout the entire testing process. A dedicated forensic DNA analyst handles each case from start to finish. This analyst becomes an expert on the case and is accessible to the client throughout the testing process and beyond.

Evidence Submission

You can consult with our forensic team regarding a specific case before you prepare and submit your evidence. Evidence, which is usually submitted by overnight courier and accompanied by a chain of custody form, must be sent in separate bags or envelopes, sealed and initialed.

Evidence Screening and Serology

Our forensic team will inspect and review the evidence received while maintaining strict chain of custody. During examination of the evidence, the analyst uses visual inspection as well as tactile and alternative light sources to detect the presence of biological stains for DNA analysis. Through serology tests, the presence of human blood, semen, and saliva can be determined.

DNA Analysis

Depending on the background of the case, the amount of DNA material available, and the results from prior testing, several DNA testing systems may be used, including STR, Y-STR analysis, and mtDNA sequencing. A genetic profile of each sample will be generated and, typically for cases using STR and Y-STR testing systems, statistical calculations will be conducted.

Results Interpretation

The forensic report describes the items analyzed and the results generated by the presumptive, confirmatory, and microscopic tests. DNA results are indicated and the STR, Y-STR genotypes, or mtDNA sequences are summarized in a table format.

Conclusions of the testing are presented and population genetic statistics are stated in the report. Our forensic DNA analysts are available to discuss and explain the interpretation of results as needed by the client.