Boney has been convicted of conspiring with David Camm to murder Camm’s wife, Kimberly, and their two children, Bradley, 7, and Jill, 5. The defense contends Boney acted on his own, while prosecutors argue that Boney stood by as Camm killed his family in the garage of their home. Boney testified against Camm just weeks ago, but Eikelenboom’s DNA findings conflict with what Boney said on the stand.
Boney contended he never touched Kim Camm or her children. But Eikelenboom said the DNA testing he performed shows Boney touched Kim Camm’s sweater and underwear, likely during a struggle before she was shot to death. Eikelenboom also said the DNA tests showed Boney touched Jill Camm, who also died of a gunshot wound, as did her brother.
Eikelenboom, on the stand all day, testified in a heavy Dutch accent about the complex “touch DNA” testing he specializes in, and the statistical analysis he employs to determine the matching of a DNA profile with a likely suspect.
He said the DNA from skin cells left on evidence through contact are more likely to break down faster over time than DNA found in blood, making it more difficult to produce a full DNA profile in older cases. He spent hours explaining to the jury how he sampled chromosomal locations in multiple ways, and then produced a range of statistical probabilities matching partial DNA profiles to Boney and the Camm family.
He found, for example, that the DNA on Kim Camm’s shirt was a strong match for Boney, who is black. He said the probability that the DNA belonged to a white person was a 1 in 17,000 probability; and a 1 in 23 million probability that it was from another African-American.
Eikelenboom said there was only a 1 in 25 chance that a partial DNA profile found in Kim Camm’s underwear belonged to someone other than Boney.