The question of how to have forensic evidence tested or re-tested by an independent laboratory comes up in my case consultations. This post will outline the general process of requesting that evidence be independently tested in a court-appointed case, and I am happy to talk with attorneys about their specific cases and help weigh the …
Resources
Homicide: Manner of Death vs. Legal Conclusion
Like many other experts, medical examiners use terms of art which might be confusing for non-experts. The use of the term “homicide” to classify a death might confuse jurors and attorneys alike. It may, therefore, be worthwhile to take steps to ensure that a medical examiner’s testimony conveys the proper information despite using a potentially …
Carts, Wax, and Oh, My: The New World of Marijuana Extracts
Originally posted on Nov. 12, 2019 on the North Carolina Criminal Law blog. The advent of cannabis legalization across the country has led to a proliferation of new types of cannabis products. There are skin patches, food and drinks (for humans and pets), vaporizer or “vape” cartridges (or “carts”), and different concentrate or extract products (“dabs”, “wax” or “shatter”, among other names). [Click …
Carts, Wax, and Oh, My: The New World of Marijuana ExtractsRead More
Are There Really Flaws in Cell Phone Location Evidence?
Originally posted on the Envista Forensics Blog on Oct. 7, 2019 by Larry Daniel, Spencer McInvaille, Eric Grabski The amount of cell phone record location information being admitted as evidence in trial is occurring at an unprecedented rate. Juries across the U.S., and globally are being presented with call detail record analysis as evidence of …
Are There Really Flaws in Cell Phone Location Evidence?Read More
DNA testing issue at NMS Labs
Attorneys from several counties have received notice through discovery that their cases that their cases were potentially affected by a DNA testing issue at National Medical Services (NMS) Labs in Pennsylvania. DA’s offices in various jurisdictions have sent samples to NMS Labs for DNA testing in recent years. The issue that has been identified is …
Staying informed on forensic issues
The new Forensic Resources website now offers email newsletters that will allow you to stay up-to-date on upcoming forensic trainings, blog posts, news articles, and specific forensic disciplines of interest to you. To subscribe, simply enter your name and areas of interest here. You’ll get notified when we post new content on the website and …
DNA Mixtures: A Forensic Science Explainer
NIST has created a primer on interpretation of DNA mixtures that explains what are DNA mixtures and why are they sometimes so difficult to interpret. The primer was published on April 3, 2019 and covers topics including: Low sensitivity vs. high sensitivity methods for detecting DNA When is a peak a peak? How to determine …
Forensics@NIST 2012 videos available online
The National Institute of Standards and Technology (NIST) is a non-regulatory federal agency dedicated to advancing measurement science, standards, and technology. NIST manages grants for technological research, works with employers and private contractors, and maintains a laboratory for in-house research in a wide variety of fields, including forensic science. Each year, NIST holds a conference …