If you have already filed, and someone else attempts to claim you as a dependent, he will not be able to e-file his return - it will be rejected. He can mail his tax return with you claimed as a dependent. Since you have already filed, he will receive a letter from the IRS asking for additional information. If he is due a refund, it will delay his refund. Ultimately, if you don't qualify as his dependent, he won't be able to claim you.
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