The Supreme Court heard arguments Wednesday about the issue of buffer zones around abortion clinics. The case concerns a Massachusetts law that creates a 35-foot protection area around a clinic’s entrance –- a distance that takes roughly seven seconds to walk. The law was enacted in 2007 following decades of intimidation, blockades and violence by anti-choice extremists, including a shooting rampage at two Boston-area clinics that killed two workers in 1994. Pro-choice advocates say the buffer zones are crucial to ensuring safe access to healthcare and guarding against harassment by anti-choice demonstrators who routinely gather outside clinics.