Should we take a harder line? Force people to prove citizenship in emergency rooms? That’s illegal, for good reason. Make verification requirements so onerous that not a single illegal immigrant slips through? Very expensive, and not smart. It would be highly likely to snag deserving citizens — like old people who don’t have their original birth certificates. And besides, we’ve tried that: A House oversight committee reviewed six state Medicaid programs in 2007 and found that verification rules had cost the federal government an additional $8.3 million. They caught exactly eight illegal immigrants.