When you go to a kosher restaurant what's your confidence level it is 100% kosher?
You're a day early... When I go to a restaurant, I trust the the organization that certified it kosher, is upholding the kosher standards. There are many kosher certifications that have been found not to uphold Kashrus to everyone's standards, and many wouldn't eat by those particular establishments. I have also seen places where a "trusted" organization seems a bit too lax for my liking, and therefore wouldn't eat there.