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Forensic Science and Technology Commons™
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Articles 31 - 36 of 36
Full-Text Articles in Forensic Science and Technology
The Honest Scientist's Guide To Dna Evidence, Richard O. Lempert
The Honest Scientist's Guide To Dna Evidence, Richard O. Lempert
Articles
The honest scientist recognizes that she herself is a test instrument, and a fallible one at that. Subjectivity inescapably enters into any human endeavor, and should not be denied. DNA testing is rife with subjective elements, no place more so than at the crucial stage of deciding whether a match exists. On the one hand, non-matching extraneous bands may sometimes be properly disregarded and patterns that do not quite meet objective matching criteria may be appropriately regarded as incriminatory matches. On the other hand, band patterns that do meet objective matching criteria may be treated as exonerative depending on how …
Comment: Theory And Practice In Dna Fingerprinting, Richard O. Lempert
Comment: Theory And Practice In Dna Fingerprinting, Richard O. Lempert
Articles
Throughout her useful paper on DNA identification, Professor Roeder properly attends to both theory and practice. Thus she acknowledges the theoretical soundness of certain criticisms that have been made of the standard paradigm used to evaluate DNA random match probabilities but argues that in practice these criticisms matter little. I am thinking here of the arguments that those cautioning against overweighing DNA evidence have made regarding the undeniable existence of population substructure and its potential implications for independence assumptions supporting the application of the product rule and for the use of convenience samples, such as data garnered from no more …
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 …
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 …
Telling Tales In Court: Trial Procedure And The Story Model, Richard O. Lempert
Telling Tales In Court: Trial Procedure And The Story Model, Richard O. Lempert
Articles
There are three ways in which stories may figure prominently at trials. First, litigants may tell stories to jurors. Not only is there some social science evidence that this happens, but trial lawyers have an instinctive sense that this is what they do. Ask a litigator to describe a current case and she is likely to reply, "Our story is ... " Second, jurors may try to make sense of the evidence they receive by fitting it to some story pattern. If so, the process is likely to feed back on itself. That is, jurors are likely to build a …
Some Caveats Concerning Dna As Criminal Identification Evidence: With Thanks To The Reverend Bayes, Richard O. Lempert
Some Caveats Concerning Dna As Criminal Identification Evidence: With Thanks To The Reverend Bayes, Richard O. Lempert
Articles
The conference panel at which this paper was originally presented was structured along the lines of a debate. The three speakers who were supposed to advocate the use of DNA evidence were labeled, as is customary, Proponents. But those who were supposed to take the negative side were not called Opponents. Rather they were labeled Caveators. I do not know who is responsible for this label, but I think it gets things exactly right. To my mind anyone considering DNA as criminal identification evidence should be a Caveator. The promise and utility of DNA analysis in identifying the perpetrators of …