Blood alcohol content (BAC) level chart Understanding Blood Alcohol Concentration (BAC) is crucial for staying safe. Here's what different BAC levels can mean for your behaviour and health: Up to 0.05 g%: You may feel good, talkative, relaxed, Can this drink lower your BAC? Testing @Safety Shot on a breathalyzer. I did this experiment over 2 days. Day 1: I took 4 shots of tequila, then tracked my BAC to establish my normal. Day 2: I took 4 What Happens During a Drinking Blackout?