In vivo evaluation of BACtrack® Skyn™: a discrete wrist-worn transdermal alcohol monitoring device marketed to the public

A discrete wrist-worn transdermal alcohol monitoring device, the BACtrack® Skyn™, was evaluated in a subject over three drinking sessions. The relationship between transdermal alcohol concentration (TAC) and breath alcohol concentration (BrAC) was evaluated. The relationship amongst contemporaneous TAC/BrAC measurements revealed an R of 0.65, while the relationship in the 45-minute post-drinking phase revealed an R of 0.89. Results obtained show promise for its use. Further research is needed with many subjects in real-world drinking situations.

In vitro evaluation of BACtrack®'s smartphone-connected personal breath alcohol analyzers

This study assessed the in vitro accuracy, precision, specificity, and measurement uncertainty of BACtrack®’s line of smartphone-connected breath alcohol analyzers. At the 0.080 g/210L ethanol vapor concentration the measurement uncertainty was determined to be ± 0.013, 0.004, and 0.006 g/210L for the Pro, C8, and C6 respectively at the 95% coverage interval. The analyzers showed an apparent ethanol response to isopropanol, and methanol, but not to acetone. BACtrack®’s smartphone-connected breath alcohol analyzers showed the ability to measure vaporous ethanol with confidence in the results.

In vitro evaluation of BACtrack®'s smartphone-connected personal breath alcohol analyzers

This study assessed the in vitro accuracy, precision, specificity, and measurement uncertainty of BACtrack®’s line of smartphone-connected breath alcohol analyzers. At the 0.080 g/210L ethanol vapor concentration the measurement uncertainty was determined to be ± 0.013, 0.004, and 0.006 g/210L for the Pro, C8, and C6 respectively at the 95% coverage interval. The analyzers showed an apparent ethanol response to isopropanol, and methanol, but not to acetone. BACtrack®’s smartphone-connected breath alcohol analyzers showed the ability to measure vaporous ethanol with confidence in the results.

In vivo evaluation of BACtrack® Skyn™: a discrete wrist-worn transdermal alcohol monitoring device marketed to the public

A discrete wrist-worn transdermal alcohol monitoring device, the BACtrack® Skyn™, was evaluated in a subject over three drinking sessions. The relationship between transdermal alcohol concentration (TAC) and breath alcohol concentration (BrAC) was evaluated. The relationship amongst contemporaneous TAC/BrAC measurements revealed an R of 0.65, while the relationship in the 45-minute post-drinking phase revealed an R of 0.89. Results obtained show promise for its use. Further research is needed with many subjects in real-world drinking situations.

In vitro evaluation of BACtrack®'s smartphone-connected personal breath alcohol analyzers

This study assessed the in vitro accuracy, precision, specificity, and measurement uncertainty of BACtrack®’s line of smartphone-connected breath alcohol analyzers. At the 0.080 g/210L ethanol vapor concentration the measurement uncertainty was determined to be ± 0.013, 0.004, and 0.006 g/210L for the Pro, C8, and C6 respectively at the 95% coverage interval. The analyzers showed an apparent ethanol response to isopropanol, and methanol, but not to acetone. BACtrack®’s smartphone-connected breath alcohol analyzers showed the ability to measure vaporous ethanol with confidence in the results.

Factors Affecting Recidivism of Drunk Driving for Car and Motorbike Users

This study explored the important factors affecting the recidivism rate of drunk driving for car and motorbike users. The respondents were students of Taiwan’s road safety training course, which was required for all drunk drivers who were suspended from driving due to the violation of regulations. The characteristics of the drunk car and motorbike drivers, such as socioeconomic variables, alcohol consumption changes, family life cycle, and changes in the number of trips, were investigated. This study estimated the models affecting the recidivism rate of drunk driving for car and motorbike users with the logistic regression model. The main variables included drivers with a university degree or above who tend not to be recidivists compared to the drivers without one. Such respondents are more willing to avoid the risk of becoming drunk driving recidivists. Moreover, the variables of alcohol use disorders’ identification test (AUDIT), breath alcohol concentration, and frequency of drunk driving all significantly affect the possibility of recidivism. In terms of family life cycle, married respondents with children aged between 1 and 5 are less likely to become drunk driving recidivists. Those who take motorbikes as an alternative vehicle after being suspended from driving cars are more likely to become drunk driving recidivists. This study suggests the measures of suspending or withdrawing car and motorbike driver’s licenses at the same time, using alcolocks to restrict the right to drive, and increasing the frequency of drunk driving crackdowns. In addition, in terms of alcohol consumption behaviors, drinkers with high risks and drunk drivers with high breath alcohol concentrations should be regarded as the key targets for future tracking in order to avoid drunk driving recidivism.

Comparison of Breath and Blood Alcohol Concentrations in a Controlled Drinking Study

In this work, 114 volunteers were dosed with 80-proof liquor to produce peak blood- or breath- alcohol concentration of 0.040 to 0.080 g/100mL blood or g/210L breath. This was followed by a 30-minute deprivation period before simultaneous blood and breath samples were collected and the alcohol concentration quantified. Blood alcohol concentration was determined by gas chromatography with flame ionization detection and breath alcohol concentration by a dual-sensor Intox EC/IR II instrument. Paired Student t-tests showed that differences between paired blood and breath alcohol results differed significantly. Results from these two measurement methods are highly correlated and, on average, measured blood alcohol concentration was 11.3% greater than breath alcohol concentration. There were ten instances of breath alcohol concentration being greater than the corresponding blood alcohol concentration, and the average difference between these two values was 0.0059 g/100mL. Agreement plots of coupled blood and breath alcohol concentration revealed a mean bias of 0.00754 g/100mL and 95% limits of agreement at -0.00705 and 0.0221 g/100mL. Once breath alcohol concentration values were truncated to the hundredths place as required by Wisconsin state statute, only three participants had greater breath alcohol concentration than corresponding blood alcohol concentration, with an average difference between these values of 0.008 g/100mL. Agreement plots with truncated breath alcohol concentration values gave a mean bias of 0.0120 g/100mL and 95% limits of agreement at -0.00344 and 0.0275 g/100mL. Data showed that typically, blood samples had greater alcohol concentrations than corresponding breath values. Differences were exacerbated by Wisconsin’s statutory requirement that reported breath alcohol measurements be truncated to the hundredths place whereas blood has no corresponding mandate.