Investigative Options

This table may serve to help investigators as they work with the laboratory to discuss options throughout the course of the investigation.

Test conducted

Original results
Original interpretation
Options for investigators
RFLP/PCR Obtained profiles. No suspects identified.

Is the original extract remaining? 1.If so, retest using STR technique and submit to CODIS.
2. If not, reextract the original sample using STR technique and submit to CODIS.

RFLP Inconclusive or no results obtained. Sample size may have been insufficient or not concentrated enough. Is the original extract remaining?
1. If so, retest using STR technique and submit to CODIS.
2. If not, reextract the original sample using STR technique and submit to CODIS.
PCR Inconclusive or result intensity below "S" and "C" dots. Sample size may have been insufficient. Is the original extract remaining?
1. If so, retest using STR technique and submit to CODIS.
2. If not, reextract the original sample using STR technique and submit t CODIS.
Conventional serology (ABO, secretor status, enzymes such as EsD, PGM, GLOI, EAP, ADA, AK). Obtained a type in these systems. Poor statistics and no searching capability. If original evidence still exists, extract the sample using STR technique and submit to CODIS.
None

1. Limited sample size.
2. No suspects, did not process further.
3. No request at the time of analysis.

 

If original evidence still exists, extract the sample using STR technique and submit to CODIS.

Some or all of the content on this page was excerpted from the Special Report Using DNA to Solve Cold Cases, developed under an award from the Office of Justice Program's National Institute of Justice. See award product disclaimer.