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Familial Search

DNA technology allows investigators to match DNA profiles obtained from crime scene samples to DNA material in a National DNA Database. This database usually contains DNA profiles from known offenders. What makes this special is that the profiles are matched indirectly; between crime scene profile and database profile a certain family relation is assumed. This means that investigaters are not looking for the actual person who left the DNA profile at the crime scene, but for his/her sibling, parent, etc.


The farther individuals are located from each other in a (related) pedigree, the less likely it is they share DNA material. Thus only a limited number of these familial relations yield sufficient information to be useful. This information is usually computed as an index (the ratio between the likelihoods of two hypotheses).

Bonaparte Familial Search computes the following LR′s/indices

Direct Direct match symbol
Paternity Index (PI) PI symbol
Sibling Index (SI) SI symbol
Half Sibling Index (HSI) HSI symbol

The Bonaparte Familial Search module implements several of the statistical options as described in

Slooten, K., Meester, R.
Statistical Aspects of Familial Searching,
Forensic Science International: Genetics Supplement Series, 3(1):167-169
More information
Case Study »
8U771 Crash

1999 Vaatstra murder. The familial search capability of Bonaparte was used to identify the killer.

August 29 2014, 09:24:03 / de2610dcd54be64a292763cbd54336f743aeba79
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