刚刚翻了一下USP42-NF-1207(2020版)也差不多是这么个定义
Positive control:A positive control is a package with a known, intentional defect. Positive controls used for leak test method
development and validation studies should duplicate study negative controls in terms of materials of construction, package assembly,
and component processing. Positive controls are used during leak test method development and validation. Some methods require the
use of positive controls during routine testing as well.