Updating the widmark equation
Attorneys with clients accused of drunk driving often are dismayed about Widmark's formula See footnote 1 and don't understand why they should know how to calculate Blood Alcohol Concentrations (BAC's).If you're not interested in using your client's drink history information for the purpose of presenting BAC evidence, you will be interested in doing that the first time the prosecutor's expert witness uses such evidence to call your client a liar.Similarly, estimating the blood alcohol concentration yielded for 0.120 g/100 ml, an uncertainty of 0.0255 g/100 ml (CV = 21.2%).Widmark's uncertainty method yielded 1.6 drinks (CV = 15.4%).For instance, despite general agreement to the contrary, it is frequently assumed that everyone is a 150 pound male.
Intertek's Warnock Hersey Mark has long been the industry preferred certification mark.The average "r" values reported by Widmark (male average 0.68, standard deviation 0.085; female average 0.55, standard deviation 0.055) are often used as defaults, but they are open to question on several grounds: It is an inconvenient fact that the specific Widmark "r" value for an individual can be known with certainty only by experiment, and furthermore that it can change with the passage of time.It is possible, however, to make a reasonable estimate of the "r" value at the time of interest; several methods have been proposed for this.1 Widmark's Equation During the early part of this century, E. TECHNICAL NOTE Simplified estimation of Widmark "r" values by the method of Forrest AD BARBOUR Central Valley Toxicology, 1521 Tollhouse Road, Suite J, Clovis, California 93611, USA Science &Justice 2001; 41: 53-54 Received 17 July 2000; accepted 27 September 2000 Key Words: Forensic science ... Simpson Several concepts and principles advanced by Widmark over 50 years ago are briefly compared with results of recently published experimental work. Wilhelm Widmark 1 Stockholm University Library has seen a rapid increase in the number of electronic resources in its collection and the percentage of the total acquisition budget devoted to such resources. Widmark: Senior Mortgage Broker 968 East Chamber Street Suite #2 • South Ogden • Utah • 84403 801.476.0200 Office • 801.336.0001 Mobile • 801.476.0204 Fax 1.866.294.4446 Toll Free • [email protected]• Military Mortgage 1 5 -Easy Steps TO BUYING THE PERFECT HOME ...
Widmark, a Swedish physician, did much of the foundational research regarding alcohol pharmacokinetics in the human body. 34/5, 888-889 (1988) 888 CLINICALCHEMISTRY, Vol.34, No.5, 1988 Medicolegal Alcohol Determination: Widmark Revisited G.The mathematical method propounded by Professor Dr EMP Widmark [1, 2] for estimation of blood alcohol levels from consumption and vice versa has proven robust and continues in general use after the passage of more than seventy years, despite the development of other, arguably more exact, approaches such as that of Watson .