I've always been something of a contrarian dater lol....knowing that people show their best sides soonest, I look for how they handle the tough spots - it makes for good judge of character - how do they handle traffic jams? poor restaurant service? car trouble?
You can learn a lot if you observe closely. So many people are so busy being self absorbed and trying to impress that they don't observe the other person carefully....often to their loss. The spoils, IMO, go to those who are early and keen observers of red flags.
I probably also carried over skills from my work to my personal life.....if you can make people comfortable with you, they'll tell you anything lol....so by the second date, "oh! you once murdered someone?" "oh interesting".
LOL...sorry some dark humor here this morning.