I was PC'd once for being in the wrong place at the wrong time. 30 people went in. I was held for 4 hours and released. Some time after that I thought I would play it smart and have the PC sealed. Spoke to a judges clerk, got an appointment with the judge. The clerk told me to tell the judge the story and I did. Both the clerk and judge laughed. Judge asked the clerk about my record, clerk says, nothing your honor. Judge says fine, the record is sealed.
I then asked the judge, "When filling out an application that asks if I ever had been arrested, how do I respond?"
Judge says, "A PC is not an arrest, so answer no."
IANAL, and I cannot qualify this other than whet he said.