What is Law 18?
Law 18 is a Canada based company selling professional soccer referee gear and accessories for soccer referees. That includes soccer referee jerseys, shorts, flags, whistles, socks, score sheets, etc. The company is headed by a soccer referee, therefore we know what a soccer referee looks for in gear.

There is no "Law 18", of course, but just the same you'll sometimes hear referees refer to it as the most important of all the Laws, because it overrides all the others.
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