A Project of the University of Michigan Law School and the MDefenders Program

Motion to Exclude – STRMix and DNA Likelihood Ratio Evidence

Argues that the likelihood ratio produced by STRMix software is unreliable because “the program’s code relies upon information that is subjective and can vary to an impermissible degree depending on the individual analyst and laboratory.” Explains factors that impact the reliability of probabalistic genotyping software, including threshold levels (what the lab considers data vs. noise), […]

Transcript – Daubert Hearing – STRMix

This hearing challenges the validity and reliability of STRMix DNA mixture analysis. Government witness: John Buckleton (creator of STRMix); defense witness: Nathan Adams (explains likelihood ratios, impact of number of contributors on the program’s output, problems with STRMix implementation

Motion to Exclude DNA “Likelihood Ratio” Testimony

Argues that “likelihood ratio” evidence — the statistical frequency of a suspect’s characteristic — has not been sufficiently validated and is misleading to the jury because the jury conflates it with probability of guilt.