opposing team attempts to substitute players. Under college and high school rules, the center, as a long snapper, may not be contacted until 1 second after the snap has been initiated. This will result in "roughing the center." Additionally, a snap must be a continuous motion. If a center halts the snap motion, this draws the penalty of "illegal snap." In college football, the Dave Rimington Trophy is awarded annually to the nation's most outstanding center. References American football positions