Never been legitimately arrested. I did go through one night as an undercover narc being processed akin to an arrestee though. It was not a pleasant experience in Fulton County Jail knowing that if I maintained my cover the deputies would probably beat my ass up and if my cover got blown the inmates would definitely kill me. And the perp I was watching never even opened his big mouth....
Other narrow scrapes :
a) My infamous incident with US INS at Toronto airport in 2002 when I was illegally detained for 3 days, interrogated without either a lawyer or consular notification, beaten up and forced to sign a false confession. I subsequently received an apology from the State Department.
b) Frankfurt airport in 1998. I was heading to BOM on Air India in transit from Chicago after finishing off a long days work at the Police Department in Atlanta. For some reason I stuck my uniform jacket into my rollaboard without noticing that I had forgotten to remove my cuffs and my tear gas cannister from my sleeve pocket. Atlanta and Chicago security failed to even notice it, but at Frankfurt they went ballistic and had me up against the wall with automatic weapons pointed at me until I could stutter "Nein, ich bein polizei amerikanisch" and produce some ID
c) My 2001 run-in with the Ontario Provincial Police on the 401 just west of Pearson airport for doing 194kmh in a 100kmh zone. They should have arrested me on the spot, but thankfully the sergeant was from the same Canadian Forces reserve unit as my cousin and cut me a break.
d) In a European country that shall remain nameless, I was waiting for a friend outside an unmarked building that housed various US interests. A US Secret Service agent approached me and asked for ID
but I told him to take a hike. He then called the local cops who I did provide with ID
and was allowed to continue waiting.