Save up to $300* over the course of your IID program vs. other national competitors. Which is correct poinsettia or poinsettia? I used to drink a half pint every day. After a heavy night of drinking, it can take more than 18 hours for your blood alcohol concentration to get back to zero. In addition, you may be fined, and your license may be suspended. Reads 4.6K. It depends on how much the person had to drink, and how long ago they drank. Before we get into the specifics of how to pass an ALCOLOCK ignition interlock breath test, its important that you know how the devices work. This is because the breathalyzer readings spike after drinking even small amounts of alcohol. The cookie is used to store the user consent for the cookies in the category "Other. For texts, text "HELP" for help. There are a number of factors that affect your Breath Alcohol Concentration (BrAC), which is what an IID measures. If you were drinking the night before, you need to wait until all the alcohol has dissipated from your system. In fact, you will still pass your ignition interlock breath test if you have a small amount of alcohol in your system. Sleep itself doesn't make alcohol disappear. A blood alcohol content (BAC) reading of between 0 and 0.049 is a pass in a breath test. If you have used any product that containsalcohol, wait at least 15 minutes before taking the test. If a driver provides a sample above the legal limit, they won't be able to start their vehicle. There is nothing a person can do to quickly reduce the blood alcohol concentration (BAC) level in their body. Depending on the alcohol content in your system, it can take up to 24 hours for the alcohol to completely leave your system. One commonly asked question relates to how long customers have to wait after drinking before they can successfully take an interlock test. How to Pass an Interlock Test While Drinking. Consider whether you should drink if you are driving the next day.