Under _____ laws, the only acceptable BAC level for people younger than 21 years of age is 0%.

Under "zero tolerance" laws, the only acceptable Blood Alcohol Concentration (BAC) level for people younger than 21 years of age is 0%. These laws were enacted in response to concerns about underage drinking and driving and aim to discourage any consumption of alcohol by individuals who are below the legal drinking age in the United States. The rationale behind zero tolerance laws is that any amount of alcohol can impair judgment and reaction times, especially in younger, less experienced drivers. Consequently, these laws impose strict penalties for any detectable alcohol in the systems of underage individuals, which includes fines, license suspensions, and other legal repercussions. By maintaining a 0% BAC requirement, these laws aim to promote safer driving practices and reduce alcohol-related incidents among young people.