https://www.amazon.com/Chickenshit-Club-Department-Prosecute...
My personal TL;DR from a couple of years ago if you don't have the time to read the book:
- It's very hard for prosecutors to secure a criminal conviction even in the most blatant cases of wrongdoing.
- Prosecutors care too much about their win rate to risk trials.
- Prosecutors have fallen into a trap where they're so dependent on the policy of offering generous non-prosecution or deferred-prosecution agreements if the company comes forward and volunteers evidence, they've become incapable of actually executing on a complex criminal investigation anymore.
- There's intense political pressure to not punish shareholders for management's misdeeds.