Chasing hot checks is another deal altogether and is actually a job of the local DA's office looks like the may be contracting it out, lots of room for abuse though.
I wonder if that's kosher under the FDCPA for regular debts?
About 20 years ago we got a little behind and had a rough time for a while and got to deal with debt collectors. Because of the experience I had I consider them to be mostly human filth. I even had one jerk threaten to come to my house and rough me up, I reminded him he had my address and he was welcome to try. A lawyer friend of mine told me if I could have recorded that threat I could have had a field day.