Answer: After you consume alcohol, it doesn’t all of a sudden hit your blood stream. It may take a while for alcohol to get into your blood stream before it actually registers. Georgia has enacted a law that allows for three hours; it’s called the three hour window. If they can establish that your alcohol level was .08 grams or more within 3 hours of driving, it doesn’t make a difference what your alcohol level was at the time of driving, rather what your alcohol level was within three hours of the time of driving because it is impossible to try and correlate back to what someone’s alcohol level was at the time they were driving. So, they’ve made it easier to try and convict people with the three hour window.