Policy Text
University of California, San Francisco
Police Department General Orders
1
9.2 Collection and Preservation of Evidence
9.2.7 Collection of Known Standards for Comparison (Revised: 5/22/23 )
A. When the following types of physical evidence/trace evidence are collected from a crime
scene, a known standard sample, if applicable, must be collected for comparison by a
sworn UCSF police officer or a UCSF Evidence and Records Technician. The known
standard comparison sample will be packaged in accordance with best practices
guidelines for the type of evidence being collected. Officers shall adhere to the packaging
criteria specific to biological evidence. Inquiries related to proper evidence collection and
packaging of known standards should be referred to the either the SFPD Crime
Laboratory or the California DOJ Laboratory . Types of known standards for comparison
include, but are not limited to:
1. Blood
2. Hair
3. Fibers
4. Paint
5. Glass
6. Wood
7. Metal
8. Soil
9. Tool marks
10. Footwear.
B. The location from which the samples are taken is critical and shall be documented on the
officer’s and lab’s reports; in addition, the results from the testing shall be included in the
physical case file.
C. All standards for comparison will be collected by officers or Records and Evidence
Technicians in accordance with procedures established by the SFPD Crime Laboratory.