Last month, ProPublica and NPR detailed how one nonprofit hospital in Missouri sued thousands of lower income workers who couldn't pay their bills, then seized their wages, all while enjoying a big break on its taxes. Since then, the IRS has released long-awaited rules designed to address such aggressive debt collection against the poor. Largely because these new rules fill a void — there were hardly any rules at all — patient advocates agree they are a major step forward. Even so, they have easily exploitable gaps. It remains up to each hospital, for example, to decide which patients the new rules should apply to. And because the rules only apply to hospitals that have been granted tax-exempt status by the IRS, they don't apply to for-profit hospitals or most public hospitals.