HAVERHILL, MA – JUNE 4: Stephen Barbour has his pulse checked by a nurse before receiving a dose of suboxone to help him detox from a heroin addiction at Serenity at Summit rehab center in Haverhill, Mass. The throws of detox were severe for Barbour, who had built a high tolerance to heroin and felt he wasn’t being given enough suboxone to help him combat the withdrawals. (Photo by Gabe Souza/Staff Photographer)