Persons employed as investigators of the Special Investigations Unit of the Contractors State License Board and designated by the Director of Consumer Affairs have the authority of peace officers while engaged in exercising the powers granted or performing the duties imposed upon them in investigating the laws administered by the Contractors State License Board or commencing directly or indirectly any criminal prosecution arising from any investigation conducted under these laws. All persons herein referred to shall be deemed to be acting within the scope of employment with respect to all acts and matters in this section set forth.