= Solution
Two useful questions separate intervention retention from actual opportunities to use it.
* \b[What happened to the intervention after release?] Ask when it was obtained, whether it was carried during the first two weeks, and whether it was sold, lost, given away or replaced. This measures adherence and possible <treatment contamination>.
* \b[Was it used during an overdose, and for whom?] Ask whether an overdose was witnessed or experienced, whether the intervention was available and administered, who administered it, whether it was used on the respondent or someone else, and the recorded outcome. This distinguishes nonuse despite availability from lack of an opportunity, and detects spillover to other individuals.
Responses can explain implementation, but cannot replace the randomized <intention-to-treat analysis>. Reincarcerated survivors are a selected subgroup, and recall errors and missing follow-up may affect their reports.
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