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Full-Text Articles in Law
Experts, Stories, And Information, Richard O. Lempert
Experts, Stories, And Information, Richard O. Lempert
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In the infancy of the jury trial, there were no witnesses. The jury was self-informing. Members of the jury were drawn from the community. It was expected that they would know, either firsthand or on the basis of what they had heard, the true facts of any disputed incident, and they were gathered together to say what those facts were. Ronald Allen and Joseph Miller, in their insightful paper, see the ideal of the self-informing jury as very much alive today. Allen and Miller tell us that jurors ideally should experience firsthand the factual information needed to arrive at rational …
The Suspect Population And Dna Identification, Richard O. Lempert
The Suspect Population And Dna Identification, Richard O. Lempert
Articles
Forensic DNA analysis typically proceeds by first determining whether alleles (one of two or more alternative forms of a gene) found in DNA apparently left by the perpetrator of a crime at a crime scene (the "evidence sample") match alleles extracted from a sample of the suspected criminal's blood (the "suspect sample"). If alleles drawn from the two sources match, the next step is to provide information about the probative value of the match by estimating the probability that alleles extracted from the blood of some random individual would have matched the alleles in the evidence sample. Thinking in terms …
Dna, Science And The Law: Two Cheers For The Ceiling Principle, Richard O. Lempert
Dna, Science And The Law: Two Cheers For The Ceiling Principle, Richard O. Lempert
Articles
The ceiling principle is an intentionally conservative way of estimating the frequency with which individuals who share particular alleles appear in the general population. It establishes frequencies for each allele by taking random samples of 100 individuals from each of 15 to 20 populations and using the largest frequency with which the allele is found in any of these populations or 5 percent, whichever is larger, as an estimate of the allele's frequency in the population of interest. These frequencies are then multiplied to yield an estimate of the likelihood that a randomly selected person would exhibit the same allelic …