Soccer is a contact sport. It is easier to hurt some one in soccer then most other sports. You can hit some one but only to a certain point just like hockey. Its really easy to break some ones bone in soccer so soccer is a contact sport but if u do the hit wrong and injure the guy u get a red card and u are kicked out of hte game but if u just hit him u get yellow like a waring.
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Yes the fourth referee checks the studs on the boots of the player when he is about to enter the pitch.