Yeh,
They can even send you EPA letters in the mail. Happened to a mate twice.
First time, was a cop walking on the street in the cross, copper walked up to his car told him he was going to get a EPA letter in the mail.
2nd time, was he just found one in his mail one day for him to visit to test the car under suspicious conditions. Got pumped. Twice.
I did know they could do this. And what was said above is a good statement, cause to be honest if I got it in the mail, I would of thrown it out until I get the reminder.