As a nanny that was arrested in '04 for DV after an ugly argument w/an ex-boyfriend, I have often wondered about this myself.
I was arrested, taken to county jail where I was held the required 72hrs.
I could have bailed out, but at the time didn't have any savings.
Never saw a judge or had charges filed against me.
I think the time in jail was for me to cool off & learn a valuable life lesson.
I'm not sure if it is even on my record as I have had multiple BG checks done for daycare, nanny + even child entertaining jobs. I always passed 100%.
Yes, I even passed Care.com and Sittercity.com checks as well as one for a nanny agency five years ago.
My advice is mums the word.
Unless you are SPECIFICALLY asked directly by the parents if you have ever been arrested, I wouldn't bring it up on my own.
I think BG checks do not show arrests since an arrest is typically an individual officers personal opinion that you committed a crime. It is not a collective opinion of the entire force.
Only convictions are typically listed, most often felonies.