Well, not entirely. Just before the first date. I don’t do it at all these days. My theory is, if I get to a third date I can start worrying about skeletons in the closet and so on. But so many of my suggestions turn into charming, one-time coffee meets that I no longer see any reason to invest in background searching.
Of course, lots of people have the opposite strategy. They’d rather not go out, so they look for ways to disqualify people ahead of time. Only a rigorous search can turn up enough doubt for that.