They could already use it. I posted a little while ago that while the ref and linesman were talking on the pitch you could see a slow motion repeat of the 2nd England goal of the Germany-England match on a screen in the stadium.
FIFA rules that they are not allowed to use TV transmission.
If a questionable call involves a red card or a goal then yes. A call that directly affects the outcome of a game but not for general play because that would slow the game down too much.
Some of the ref decisions throughout the world cup have been shocking.
Also, i do think that if a player is shown to have taken a dive in a replay then they should be red carded!
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Should Soccer have a way to Instant replay all questionable calls?(Vote Below)