Some of the most visible personnel of the CSP were its State Security Officers (SSOs) who were peace officers while on duty. SSOs held powers of arrest as regular Police Officers under the California Penal Code (CPC), however, they were not full-time peace officers. Their powers of arrest were only while on duty performing their specific assignments. SSOs were usually at fixed locations at state buildings on foot beats. SSOs sometimes performed patrol (automobile) duties in very limited geographical areas such as Exposition Park in Los Angeles.