I was told that this job would be very educational, and that's turned out to be very true. For instance, do you know what the wholesale price of crack cocaine is? Do you know the retail price? Do you know what the difference between crack and cocaine powder is? Do you know what drug dealers mean by "key," "bird," or "cookie"? Did you know that real people actually use the term "baby mamma" (as in "he spent a lot of time talking on the phone to his baby mammas and females")? I've learned all of that, and even more.
I've also learned some things not to do, if I ever decide to embark on a life of crime. For instance, don't keep a detailed journal describing everything you do to further your mail fraud scheme. And if you do keep such a journal, don't throw it away in the trash can when you discover that you're under investigation. Shredders were invented for a reason. Don't talk to other people in jail about all the illegal things you did. Fellow inmates are not your friends, and they will be quite happy to testify against you in exchange for leniency in their own cases.
Dave hates the criminal cases, but I think they're really quite interesting. And educational as well.