Robert Martin no longer lives as a homeless man in Boise, as he once did. But Martin, now a North Idaho resident, visits that city several times a year to see his son. And when he does, he doesn’t have a place to sleep. Martin’s experiences, along with those of a handful of other homeless people, are at the heart of last week’s ruling by the federal 9th Circuit Court of Appeals that it is unconstitutional for a city to prosecute a homeless person for resting on public property when there is no shelter available.