Suppose I have a drink, then drive home after an hour. If I get stopped at a police ride check, I usually say I have not consumed any alcohol, because I don't want to take a breathalyzer test or risk the small chance of blowing just over the limit. What crimes, if any, am I committing by lying to the police in this case? What are the punishments? Is this crime often prosecuted? I'm specifically wondering about Canada.
Note: Drunk driving is obviously bad, and I don't do it. This question is not about "how to get away with drunk driving", but rather about the consequences of lying to police about having one or two drinks, which I assume many people do.