It is quite common in DUI cases involving traffic accidents or when a person runs out of gas for more-than-usual time to pass before the police test one’s blood alcohol content (BAC) either via a breath machine or blood sample. What if two hours passes after one was driving, but the BAC is measured at 0.07%? Surely that means when the suspect was driving, his or her BAC was over 0.08%, right? To reach such a conclusion, one must reverse extrapolate a BAC. This is unreliable and thus, junk science. To read why, click on the following link.