Las Vegas police cracked an ancient murder case with a record low amount of DNA


Las Vegas police seem to have broken records Use blood to find suspects in cold cases. BBC News Report Law Enforcement in Navegas Claim The smallest known volume of DNA was used to solve the case of the murder of 14-year-old Stephanie Isaacson (pictured) in 1989. Investigators only sent 0.12 nanograms of DNA samples, or about 15 cells, to Othram’s genetic sequencing laboratory to help find matches.In terms of context, a typical Home DNA Test Kit Collect at least 750 nanograms.

Othram used these sequences to comb through the ancestry database and identify the suspect’s cousin, and determined that Darren Roy Marchand was the culprit. The team confirmed a match by comparing the sample with the DNA of Marchand who was arrested in a murder in 1986. Marchand was never convicted and died in 1995.

After resident Justin Woo donated money to help law enforcement use the “minimum” DNA level to solve the case, Vegas police launched an investigation. Othram’s investigation began on January 19, but the company did not identify the suspect until July 12.

In discussions with the BBC, Othram CEO David Mittlemen described this effort as a “huge milestone.” This can theoretically solve the cold situation that previously thought the sample was too small to be used.

However, this breakthrough may not make everyone excited.There are concerns that law enforcement agencies may violate privacy when conducting these tests. The Department of Justice has Established guidelines It is to prevent such abuse. Although there are no signs that the Vegas authorities have crossed the line in the Richardson case, the wider range of potentially resolvable cases also expands the possibility of more invasions of privacy.

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