O qua: https://www.amazon.com/Money-Laundering-Guide-Criminal-Investigators/dp/143986912X
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It was a while ago I saw this. It may have even been something posted on reddit. I did a search and couldn't find it again. I think it was an interview with Vince Gilligan about something unrelated to the book, but the book was in the background. I even had it on my amazon wish list for awhile - though I can't remember what the book was either - It didn't wind up getting it. It was something along these lines:
https://www.amazon.com/Money-Laundering-Guide-Criminal-Investigators/dp/143986912X
Point being, if you are writing about con men, it's always worthwhile to do research. It's easier to make up new cons once you know the ins and outs of how com men ply their trade. Reading case studies can give you a ton of ideas to adapt. George R. R. Martin researched the hell out of medieval europe for Game of Thrones - specifically the War of the Roses. The idea of warlords not attacking each other when invited into each other's castles came out of this research. You can tell that M. Night Shyamalan did a lot of research on child psychology for the 6th Sense - it's his protagonist's job - in order to portray it convincingly Shyamalan had to. I've never heard him say this, but I'm sure the Munchausen Syndrome bit (where the mother is poisoning her daughter) came out of his general research.
I read a script from someone who was writing about a cop, and they obviously only knew what a cop acts like based on what they knew from television. You can tell a script from someone who knows their subject and someone who doesn't. Great stories are all about the details. Someone who knows the subject well can give those details convincingly where others are just aping what they've seen and a reader/viewer can tell the difference.