[Solved] Only those applicants who possess a satisfactory level of WRCs necessary for the job should be given an integrity test. Colonoscope: A thin, flexible tube equipped with a camera and light at the end, used to examine the inside of the colon. Proctoscope: A medical instrument designed for the visual examination of the rectum. Valsalva Maneuver: A technique where one attempts to exhale forcefully with a closed mouth and pinched nose, used in medical examinations. Occult Blood: Blood present in such small quantities that it is not visible to the naked eye, often detected through specific tests.