California law requires that all prospective peace officers be evaluated by a licensed physician to ensure that they are medically and physically qualified for their work [2 Cal. Gov. Code 1031(f)].
https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1031.&lawCode=GOV]

The UC Davis Medical Surveillance Program follows recommendations for the medical screening of the prospective peace officers provided by the Commission on Peace Officer Standards and Training.
https://post.ca.gov/medical-screening-manual

POST evaluation components include, but are not limited to: Vision, Audiogram, Spirometry, EKG, Blood Tests, and Physical Exam.