I'm not sure how this works, or if they still do it, but SFPD has (used to, anyway) this thing called Special Police, or Special Patrol, where businesses can hire real cops as 'security guards' for their businesses.
When I was a kid growing up in SF they used to even drive around in unmarked cars and shine a spotlight into the businesses who 'hired' them etc.
If you see him/her there again, check out his shoulder patch. Looks just like SFPD but will say "Special Patrol" or something different like that.
Not hard to imagine how a biz like MBOT would benefit from this.