Final answer:
A blood alcohol concentration restriction is required when operating heavy machinery. Alcohol impairs tasks requiring skill, making driving under the influence illegal due to safety risks. A Breathalyzer measures blood alcohol levels to ensure legal compliance.
Step-by-step explanation:
A blood alcohol concentration restriction will be required when operating heavy machinery. Consuming alcoholic beverages adversely affects the performance of tasks that require skill and judgment. This is crucial when it comes to safety-sensitive positions such as driving a tractor, operating heavy machinery, or caring for livestock. In most countries, driving under the influence of alcohol is illegal due to the increased risk of accidents and injuries. Alcohol intoxication is often legally defined as a blood alcohol concentration (BAC) greater than 5.4-17.4 mmol/L (25-80 mg/dL or 0.025-0.080%). The Breathalyzer is a common device used to measure alcohol levels and ensures individuals meet the legal requirements for operating machinery or vehicles.