Iowa Admin. Code r. 875-173.46 - Requirements for seconds
Seconds shall not enter the ring until the timekeeper indicates the end of the round and they must leave at the sound of the timekeeper's whistle before the beginning of each round. If the chief second or anyone for whom the promoter is responsible, such as a manager, enters the ring before the bell ending the round has sounded, the fight shall be ended and the decision awarded to the opponent. Seconds shall not smoke in the ring or corners.
Notes
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Except for championship fights of national recognition, the referee shall stop the fight after a fighter is knocked down three times in one round and declare the opponent a winner on a technical knockout (TKO).