Discussing federal prosecutions, specifically, they talk about something known in slang as “the head-shot” for federal investigators and prosecutors: finding that someone took a loan from an associate, then used that money to secure a bank loan (a mortgage, say) while misrepresenting the loaned money as their own, then later paid the money back (making it clear, in the paper trail, that it was in fact a loan).
It’s very easy to understand, easy to prove beyond a reasonable doubt, it’s fraud, and it’s a great entry to comb through the books looking for more crimes.
“Something every kid does with their parents to buy their first home”, one Baltimore cop observes.