History of the Laws of the Game - 1980-1990
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1981

Law III - Number of Players
A player who has been replaced shall not take any further part in the game. A substitute shall be subject to the authority and jurisdiction of the referee whether called upon to play or not.

Punishment: If a substitute enters the field of play without the authority of the referee, play shall be stopped. The substitute shall be cautioned and removed from the field or sent off according to the circumstances. The game shall be restarted by the referee dropping the ball at the place where it was when play was stopped.

Law XII - Fouls and Misconduct
A player shall be sent off the the field of play, if, in the opinion of the referee, he:

* is guilty of violent conduct or serious foul play
* uses foul or abusive language
* persists in misconduct after having received a caution

1982

Law VI - Linesmen
The linesmen are to indicate:

* when the ball is out of play,
* which side is entitled to a corner-kick, goal-kick or throw-in
* when a substitution is desired

Law XII - Fouls and Misconduct
Introduction of the four-step rule:
...from the moment the ball comes under his (the goalkeeper's) control, he takes more than four steps without releasing the ball into play and - having released it - he touches the ball again before it has been touched or played by another player...

1983

Law XII - Fouls and Misconduct
Modification of the four-step rule:
...from the moment the ball comes under his (the goalkeeper's) control, he takes more than four steps in any direction whilst holding, bouncing or throwing the ball in the air and catching it again, without releasing the ball into play or having released it into play before, during or after the four steps - he touches it again with his hands before it has been touched or played by another player...

1984

Law VIII - The Start of Play
Drop-ball in the goal-area: on that part of the goal area line which runs parallel to the goal-line, at the point nearest to where the ball was in play when play was stopped.

Law XIII - Free-Kick
An indirect free-kick awarded to the attacking team within its opponent's goal area shall be taken from the part of the goal-area line which runs parallel to the goal-line, at the point nearest where the offence was committed.

1985

In various Laws: drop-ball provision in goal-area (cf. 1984) also extended to be consistent.

Law XII - Fouls and Misconduct
Modification of the four-step rule:
...from the moment the ball comes under his (the goalkeeper's) control, he takes more than four steps in any direction whilst holding, bouncing or throwing the ball in the air and catching it again, without releasing the ball into play or having released it into play before, during or after the four steps - he touches it again with his hands before it has been touched or played by another player of the same team outside of the penalty-area, or by a player of the opposing team either inside or outside of the penalty-area.

1986

Law III - Number of Players
The substitution is completed when the substitute enters the field of play, from which moment he becomes a player and the player whom he replaces ceases to be a player.

Law XIV - Penalty-Kick
The player taking the penalty-kick has to be properly identified.

1987

Law VII - Duration of the Game (against time-wasting)
Allowance shall be made in either period for all the time lost through substitution, the transport from the field of injured players, time-wasting and other cause ...the amount of which shall be a matter for the discretion of the referee.

Law XIV - Penalty-Kick
A goal may be scored directly from a penalty-kick. When a penalty-kick is taken in the normal course of play, or when time has been extended at half-time or full-time to allow a penalty-kick to be taken or retaken, a goal shall not be nullified if, before passing between the posts and under the crossbar, the ball touches either or both of the goal-posts, or the crossbar, or the goalkeeper or any combination of these agencies, providing that no other infringement occurred.
(in addition to that several decisions by the Board in case of encroachments)

Law XV - Throw-in
Decision: A throw-in taken from any position other than the point where the ball passed over the touchline shall be considered to have been improperly thrown in.

1988

Law I - Decision:
The goalposts must be of white colour.

Law III - Number of players:
Substitutes may be used under the rules of any official competition under the jurisdiction of FIFA, Confederations or National Associations, ...
...a team shall not be permitted to use more than two substitutes from more than five players...

1989

Law IV - Players' equipment
(Codification of a practice) Footwear must be worn by players and conform to the following standards: ...and pertinent decisions.

1990

Law IV - Players' equipment (introduction of shinguards)
The basic compulsory equipment of a player shall consist of a jersey or shirt, shorts, stockings, shinguards and footwear (plus pertinent precisions regarding the shinguards.

Law XI - Off-side (being level)
A player is in an off-side position ..., unless

* b) he is not nearer to his opponents goal-line than at least two of his opponents
* ...3. b) if he receives the ball direct from a goal-kick, a corner-kick or a throw-in.

Decision: A player who is level with the second last opponent or with the last two opponents is not in an off-side position.

Law XII - Fouls and Misconduct
Mandatory Instruction of the IFAB ("professional foul")
If, in the opinion of the referee, a player who is moving towards his opponents' goal with an obvious opportunity to score a goal is intentionally and physically impeded by unlawful means, i.e. an offence punishable by a free-kick (or a penalty-kick), thus denying the attacking player's team the aforesaid goal-scoring opportunity, the offending player shall be sent off the field of play for serious foul play in accordance with Law XII (n).