RFE/ Certified Police Clearance Report

I am seeking clarification on the certification process for Police Clearance Records, as my mother has received an RFE for her i485 application. Despite providing fingerprinting twice, USCIS is now requesting certified original or certified copies of these records. I have obtained a local police clearance report but am unsure about certifying it. Can you advise on how to certify the report or whether submitting that local police clearance report will be enough or not?

Thanks..