I would not do it, however the following thread relates to your question:
Moved: BREAKING NEWS: San Francisco OPEN CARRIER found NOT GUILTY by JURY
San Francisco DA who charged Open Carrier with Concealed in Vehicle violation looses Jury Trial
If an SF jury finds not guilty in this case, I thinkyou may be OK. Many Kali LEOs will arrest you and let you prove yourself innocent in court with no retribution to themselves for being ignorant of the law.
I must clarify what you wrote, by holstered you mean open and not concealed.