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Concrete mixing ensures a homogenous blend where aggregates are well-coated with cement paste. Concrete mixing is typically done using two main types of mixers: batch and continuous. Batch mixers handle one batch at a time, thoroughly combining materials before discharging and receiving the next batch. In contrast, continuous mixers receive a steady flow of ingredients, mixing them consistently and discharging without interruption. Within batch mixers, tilting drum mixers mix with internal...
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Exploring the probative value of mixed DNA profiles.

Maarten Kruijver1, Jo-Anne Bright1, Hannah Kelly1

  • 1ESR Limited, Private Bag 92021, Auckland, 1142, New Zealand.

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This study introduces a new method to predict the range of likelihood ratios in probabilistic genotyping. This aids in assessing the strength of evidence and making informed decisions in forensic investigations.

Keywords:
Adventitious matchDNA mixture interpretationDatabase searchProbabilistic genotyping

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Area of Science:

  • Forensic Science
  • Genetics
  • Biostatistics

Background:

  • Probabilistic genotyping is crucial for DNA mixture analysis in forensics.
  • The reliability of likelihood ratios depends on mixture deconvolution accuracy.
  • Sample quality and complexity significantly impact discriminatory power.

Purpose of the Study:

  • To present a novel method for exploring expected likelihood ratio ranges.
  • To evaluate the method's utility in addressing specific forensic case questions.
  • To assess the efficiency and speed of the proposed approach.

Main Methods:

  • Development of a probabilistic genotyping method to explore likelihood ratio ranges.
  • Application of the method to simulated case scenarios.
  • Analysis of questions regarding minor contributors, database searches, and familial probabilities.

Main Results:

  • The method efficiently explores the range of likelihood ratios for various propositions.
  • Demonstrated utility in assessing the potential for large likelihood ratios from minor contributors.
  • Provided insights into the feasibility of identifying donors in large databases and evaluating familial probabilities.

Conclusions:

  • The presented method offers a valuable tool for forensic investigators.
  • It aids in decision-making regarding case progression and database inclusion.
  • The method enhances the interpretation of DNA evidence by quantifying potential discriminatory power.