Detailed rules differ by state, but here are some general rules. The thrower is forbidden from stepping out of the circle until the official gives him clearance. Some areas allow the thrower to step ON the line as long as he is not OVER the line, but in many areas stepping on the line disqualifies the thrower. The discus must land within the two lines that form the throwing sector. If it lands outside of the line, it is called a scratch-aka it doesn't count. This is another area where the rules change depending on where you are- in some places the throw will count if the disc lands on the line; in other places that throw would be a scratch.
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Some of the rules and regulations of the discus throw are the thrower must stay inside of the throwing circle and the thrower may use chalk but no tape on hands or fingers. Also, the thrower has to wait until the discus has hit the ground to leave the circle and must exit from the back part of the circle.