College Soccer stops the clock for injuries. Why can't FIFA?

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A manager may make unlimited substitutions, and each player is allowed one re-entry which must occur in the second half of the match. All matches have an overtime period if the game remains tied after 90 minutes. As opposed to a classic two half overtime, a sudden death rule is applied. If neither team scores in the two ten-minute halves, the match ends in a draw (unless it is a playoff match, then it would go to kicks from the penalty mark). College soccer is played with a clock that can be stopped when signaled to by the referee for injuries, the issuing of misconducts, or when the referee feels a team is wasting time. The clock is also stopped after goals until play is restarted, and the clock generally counts down from 45:00 to 0:00 in each half. In most professional soccer leagues, there is an up-counting clock with the referee adding injury time to the end of each 45-minute half

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