Okay, so there was a man named Beaulac who did something that was against the law. The police arrested him and charged him with a crime.
But then, some other people looked at the law and said that maybe the law wasn't clear enough about what Beaulac did wrong. They said that maybe the law was too confusing, and Beaulac couldn't have known that he was breaking it.
So, they took Beaulac's case to court to try to figure out whether the law was okay or not. The judges had to decide whether Beaulac was guilty or not guilty, based on whether the law was clear enough or not.
After a lot of thinking and talking, the judges decided that sometimes the law can be too confusing for regular people to understand. They said that when the law is too confusing, it's not fair to punish someone for breaking it.
From then on, when judges are trying to decide whether someone is guilty or not, they have to think about whether the law was clear enough for the person to understand. If it wasn't clear, then the person might be found not guilty. That's what R v Beaulac means - it's a court case that helped make sure the law is fair for everyone.