Theoretically, some bacteria could have died overnight, which would be good. In general, simple instruments constructed of stainless steel or other solid non-porous materials are easy to wash off and autoclave. Complicated constructions in which multiple parts fit precisely inside other parts constructed of different materials are not easy to wash and autoclave. Scope manufacturers would be encouraged to design more sensibly if physicians could be held accountable for cross-contamination. This would require a more aggressive regulatory regime.