启动调查的同时立即叫停招募病人是“非常极端情况下严重攸关受试对象安全”的严厉措施。
http://www.hhs.gov/ohrp/compliance/ohrpcomp.pdf
OHRP does not take any action against an institution without first affording the institution an opportunity to offer information that might refute the allegations or indications of noncompliance, except
in very rare circumstances where serious concerns about subject safety require an immediate suspension of research activities.
根据这个memorandum，“Evaluation”一词毫无疑问是“调查”。