Instructions

Use the following formulas to answer the questions listed below. Each question is worth 2 points and extra credit questions are worth 1 point each.

BAC = [alcohol consumed in grams/(body weight in grams x r)] x 100

r = 0.55 (females)

0.68 (males)

A standard drink of alcohol = 14 grams

1 lb = 454 grams

Extrapolation

Retrograde extrapolation is done when we are trying to go back and determine what the BAC was at the time of an event. For instance, the police obtained a blood sample 3 hours after a car accident. What was the BAC at the time of the accident?

BAC + (time in hours x 0.015)

Forward extrapolation is done when we are trying to look forward to what a person's BAC is from a drinking history. For instance, an individual was noticed drinking 5 drinks at a bar and then he was involved in a car accident 1 hour later but he refused to provide a breath/blood alcohol sample and the police could not obtain a warrant. What was the BAC at the time of the accident?

BAC - (time in hours x 0.015)

Questions

1. A 100 lbs. female drank 8 standard drinks over a period of 4 hours. What would her BAC be at the end of 4 hours?

2. A 300 lbs. male drank 15 standard drinks starting at 8:00 p.m. He is pulled over and arrested and his blood is drawn at 1:00 a.m. What was his BAC when he was arrested?