Terry reveals to you that he frequently uses heroin. He used to share needles while in jail for possession, but since being released 8 months ago, exchanges his used needles at the mobile needle exchange unit. Terry feels that because he doesn't share needles that his injection habits are safe.
You reinforce to Terry that not sharing needles is a positive step in protecting his health, but that you need more information about his drug use to determine if he is at risk.
What further information would be helpful in assessing Terry's risk?
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