The Mods:
ExtremeModsOHKO - Die from any source of damage, excluding fall dmg and probly cars idk I didn't test
ExtremeModsDetectiveRBack - kill civi or detective to affect investigation
Nightmare 4 - Not Fully Finished, but this is basically the lite version.
For more details:
Investigation added back.
Nasara more angry at u if you play like poo by taking extra $$$
Stats for health, stealth, and all that jazz was adjusted.
SWAT is more scary with alternative loadouts.

Hall of Unlucky AF (CnB NM1):
braidy08: got hkan'd, crowbar'd, SWAT event'd in multiple times in a row.. plus dragon dogs

Hall of Beating it (Nightmare V1)
braidy08 (https://www.youtube.com/watch?v=AYYxp5NBB58)
Sergeant Panda
KevKild (https://www.twitch.tv/videos/2207414731)