Flu shots everywhere?

I just saw a news cast on MSNBC about flu shot booths now in airports. It seems that no matter where you go, flying, shopping, anywhere, you can get a flu shot. How do we know that they are being regulated and using sterile supplies and even giving a flu vaccination and not purified water?

So here's my question.
Who is getting flu shots and where are you getting them?

I'm getting one next week for the first time in a few years and it's being offered by my employer right in our employee break room.