Thanks for taking the time to crit my logline.
All of the issues you mention are addressed in the script, but, unfortunately, I didn't have room to include them in my logline.
The prosecutor, Dev Stone, is about to try the businessman for bribing public officials when the guy turns up dead, an apparent suicide. The thing is, the businessman had called Dev a few hours before his death to offer information on a twenty year old murder in exchange for leniency at sentencing. He doesn't give any details about the murder at that point, but he does imply that Dev's father, the Chief of the LAPD, is involved (turns out, the Chief killed a teenage prostitute back in the day when he was a detective).
The cops close the case quickly; Dev thinks too quickly. Dev smells a rat because the businessman sounded like he had a get out of jail card, so why would he off himself? He also senses an opportunity for a case even bigger than the first one. He begins his own, unsanctioned investigation, getting resistance from the cops, including his father, all the way.
Given your expertise with the LAPD, may I impose and ask you a question? I noticed in "LA Confidential" that the detectives were referred to either as "officer" or by their rank. Is that accurate or should they be addressed as "detective"? Thanks.