If you drink a beer the day before get breathalyzed will it show up?

Generally, no. The alcohol in a beer is usually cleared from the body within a few hours. However, there are some factors that can affect how long alcohol remains in the body, such as the person's weight, gender, and metabolism. In some cases, alcohol can be detected in the breath up to 24 hours after consumption. If you are concerned about whether or not you will be over the legal limit for driving, it is best to avoid drinking alcohol before driving.