Before I retired in 2016 my home base was Sebastian, Florida (at Velocity).  Badges had been required for years.  Passcodes at the gates.  Pilot were expected to report anything suspicious. 

I was in a T-hanger when an unknown car and person drive up to the gate, went to his trunk and removed an old stop sign with a tether road, tossed it under the gate to trigger the exit-open and drove through. 

I called the local police and did not approach the guy.  Police first spoke to me, then to him.  Later they told me he had a pilot license and with 15 minutes of search was able to find and show them his badge.

I supposed throwing a stop sign must have been more convenient than remembering his passcode.