New Neighbors

So I get home tonight around 7:30 and start walking up my stairs, when I am stopped by this woman who happens to have a Sheriff badge around her neck. She asks if I have seen the people who live below me and I told her yes. She asked if I knew what time they are typically home. My first questions is, are you looking for a guy?
Side note-Now, there is a guy and his mom (I think) who live below me. This kid is so rude and drives a BMW. In the afternoon and even sometimes at night he pulls into the garage (which is right below me) and blasts his music! It then echos up into my place and also out the front of his garage, bouncing off the hill right outside and into my apartment.
Anyways, she says no and that she is looking for a Sherry. I told her that I have seen an older woman there. She asks what time are the typically home. This kind of bothers me just a little. I informed her that I hear the garage door open and close all night and that I know for sure there is someone home during my lunch hour. She wrote down the times I gave her, looked at me, smiled and said "Thank you". With that she got into her car and drove off.

SO WHAT KIND OF PEOPLE DO I HAVE LIVING BELOW ME???????
Updates sure to follow.