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Communicability
The danger is obviously if the blood is transferrable to someone else.... transferability is what makes it excessive. A spot of blood is not readily transferrable unless you think players are going to start sucking on each other's jerseys. A player that is actively bleeding, or dripping, or that can be touched and blood transferred, is excessive. Same would be true of a uniform. Spots of blood that have been wiped off are still visible but are not realistically going to transfer to another player. Spots, of themselves, have no further source of blood and therefore do not need to be covered if they have been wiped off. Open wounds do have a further source of blood... they must be bandaged and covered.
These are just my opinions but are what I use as a rule of thumb.
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"There are no superstar calls. We don't root for certain teams. We don't cheat. But sometimes we just miss calls." - Joe Crawford
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