German supreme court (BGH) ruling on blood alcohol determination accuracy.
Requirement for standard deviation under 10% for legal validity.
Ring tests ensure procedural control but not retroactive accuracy proof.
Purpose:
To evaluate the scientific validity of using standard deviation of single measurements to prove blood alcohol determination accuracy.
To assess if the BGH's standard deviation limit is scientifically appropriate for retroactive accuracy verification.
Summary:
The study found that standard deviation alone cannot retroactively verify the accuracy of individual blood alcohol measurements as required by the BGH.
Despite exceeding the BGH's standard deviation limit in an example case, the blood alcohol result was deemed valid.
The current 10% variation limit for single values is considered barely appropriate by today's accuracy standards.
Impact:
Challenges the legal standard for proving blood alcohol test accuracy based on single measurement variability.
Suggests that current legal standards may not fully align with modern analytical accuracy requirements.
Highlights the need for a nuanced approach to evaluating forensic evidence accuracy.