Final answer:
An individual can be arrested for having a BAC level over 0.08%, which is considered legally intoxicated in most places. BAC is measured using tests like a Breathalyzer, with intoxication affecting cognitive and motor functions that make driving dangerous.
Step-by-step explanation:
If under the influence of alcohol, you can be arrested for a blood alcohol concentration (BAC) level more than 0 nano grams per mm of blood. In most countries, including the majority of US states, a BAC level of 0.08% by volume is considered legally intoxicated. The BAC corresponds to the amount of alcohol in one's bloodstream and is typically measured through blood or breath testing using devices such as a Breathalyzer, which gauges alcohol levels based on the oxidation of ethanol by the dichromate ion in the breath.
Alcohol intoxication can result in impaired cognitive and motor functions, making activities such as driving hazardous. Legal limits are established to prevent alcohol-related accidents. BAC levels can be influenced by several factors, including the number of alcoholic drinks consumed, the time frame in which the drinks were ingested, and the individual's metabolic rate at which alcohol is broken down, approximately 3.3 mmol/L (15 mg/dL) per hour. Exceeding the legal BAC limit can lead to arrest, legal charges, and other severe consequences.