"IF RUNNER IS BETWEEN BASES, STANDING UP, AND IS HIT BY THE THROW IT IS A VIOLATION AS HE ALTERED THE PLAY"
http://www.blinn.edu/Brazos/kine/HKN...de%20rulen.htm
"In addition, it is a no call when the runner does not slide in a force situation and does not contact the fielder or alters the play. The force-play slide rule isn’t enforced as long as the fielder has cleared the area. In other words, as long as the defensive player has moved away from the base before the runner arrives and he doesn’t slide and doesn’t have any effect on the play, there is no violation."
http://www.umpire.org/writers/force.html
"A.R. - If a runner goes into a base standing up and does not make contact or alter the play of the defensive player, interference shall not be called."
NCAA 8-4, pages 86-87,
http://www.ncaa.org/library/rules/20...ball_rules.pdf