By design, the government has placed different agencies in charge of several separate databases and watch lists, deliberately splitting responsibility between the intelligence community and law enforcement agencies.
States that allow same-sex marriages, civil unions, or domestic partnerships for tax purposes could give people in those relationships the federal tax savings from income splitting even if the court upholds DOMA. They could use the same approach some non-community property states used right after World War II: establish community property rights for tax purposes only.