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					Originally Posted by EricH  LOL. How do you even determine eligibility after-the-fact if you do not receive a lineup card? | 
	
 [Sigh...] I/we do not determine eligibility. The leagues maintain rosters of their players from the start of the season and/or if additions are allowed during the season. If additions are allowed, there may be a cutoff for playoff eligibility, or a player must have appeared in "X" amount of games to be playoff eligible.
A player's name on a lineup card does not mean s/he's eligible per the leagues rules/bylaws. 
In fact, the five recreational leagues I work don't have lineup cards. When we get to USA invitational tournaments or state tournaments, lineup cards are required.