I understand that the concept that the lines around the field that signal into touch are considered part of the field and the ball is not out untill it fully crosses the line. However, what is the decision on weather or not a clear foul was commited inside the 18 or outside it? Do we make or determination by the position of the ball or the player or where the fouling player stood? What happens if either one of those three is directly on the line marking the 18? I had a blatant foul directly on the border that I called as a PK but in retrospect am unsure if I was justified in doing so. The foul happened with the player who was fouled on top of the line and moving sideways for a better shot on goal. In the end I called it a PK because it "looked" like a PK-but Id love to have a firmer basis than my instinct after playing for years.