Expensive restaurant or picnic in idyllic spot first date which one girls?

No but that is a risk you have to take. Besides it is unlikely everyone will know someone inside out before dating. Some people are married and still dont know their husband rape and murder people till they are caught. That can happen to anyone anywhere at any time not just on a date. Besides what's to say you dont go on a date to a restaurant, the night goes well, he is sweet and charming, not creepy at all, one thing leads to another and you find yourself excepting the invite back to his place and he does that. you need to ease up on watching so many episodes of NCIS..

Its just an extremely unwise move for a first date. Its like you're trying to give her an excuse to say no.

Maybe for a third date once you've successfully convinced her you're not a serial killer....