What probally happened was someone panicked and called the police.
They came and asked if they could come in.

Now here's where %99.9 of people make the mistake. They get nervous and allow LEO to search their home/car. I think people tend to think if they say no it will make them look guilty so they just grab their ballz, say yes, and pray LEO won't find what they've hidden.

And TADA! Before you know it they found Lots "o" pot when all you had to do in the first place was prove to LEO you KNOW YOUR RIGHTS and will STICK BY THEM.