Well, I've seen them often in Oakland on the pedestrian ramp between the Oakland Coliseum and the Coliseum BART station. When there's an event there's any number of unlicensed vendors selling anything from unlicensed T-shirts/caps to those bacon wrapped hot dogs. I have never seen one panic, ever. That ramp is always patrolled by Oakland PD and BART PD. However, once on the way to a Raiders game I was guilty of consuming a beer on the ramp, which is technically illegal, and one Oakland cop just motioned to me towards a trash can where I got the message and tossed my beer. I have however consumed a beer right next to one of the entrances where an Alameda County Sheriff deputy saw me use the edge of a trash can as a bottle opener.
So that was Exposition Park Police? I'm just wondering what they really have to do other than chase down illegal vendors.
http://expositionpark.ca.gov/public-safety/
ILLEGAL VENDING
In order to maintain a safe and enjoyable visit to Exposition Park, guests should not purchase from unauthorized and outside vendors selling food and goods in the Park.
The dispensing of food from any wagon or pushcart located upon any sidewalk/street is prohibited on State property. A pushcart is defined as a hotdog cart, ice cream cart, or detached trailer hotdog or fruit cart. Violators are subject to a citation.
Sale of goods or non-food merchandise on sidewalks and streets is also prohibited on State property. This includes items in sellers hands, sold from tables, crates, or boxes. Violators may be subject to a citation or arrest for a violation of section 42.00(b) of the City of Los Angeles Municipal Code.