For decades, the breathalyzer has been the gold standard for roadside alcohol enforcement — simple, fast, and tied to a legally recognized threshold: 0.08% BAC. But as marijuana legalization expands across the country, law enforcement has faced a fundamental problem: how do you prove a driver is impaired right now?

You’ve been pulled over. An officer suspects you’ve been drinking and asks you to submit to a chemical test — a breath test, a blood test, or both. You have a split second to decide. Should you refuse? The answer is more complicated than most people expect, and the consequences

You’re driving home late on a Friday night and see a line of cars ahead, orange cones, and officers in reflective vests. You’ve just hit a sobriety checkpoint. What happens next — and what rights do you have — depends on a body of law most drivers never think about