Also here, from the DC 529 plan website:
"Are there any DC income tax consequences for early withdrawals?
Any DC tax deduction taken shall be subject to recapture in the following scenarios:
"a withdrawal or rollover is taken within two years of the establishment of the account for any reasons other than the payment of qualified higher-education expenses;
withdrawals taken due to death or disability of, or scholarship to, a designated beneficiary (except that only the amount of the scholarship is exempt from recapture);
the funds are transferred to another account under the plan."
http://www.dccollegesavings.com/About-FAQ.aspx#TaxEarlyWithdrawal