As a condition of continuing employment for any applicant who has been offered a conditional offer of employment as a fully commissioned peace officer or a reserve officer, including any person whose certification has lapsed as a result of a break in service of twenty-four consecutive months in the officer's service as a fully commissioned peace officer or reserve officer, the applicant shall submit to a background investigation including a check of criminal history, a psychological examination, and a polygraph or other truth verification assessment as authorized by the county, city, or state law enforcement agency in compliance with the requirements of this chapter.