I was 6 years old too when my mother had me arrested for theft!!
I had to take a penny to school every day and she kept her change in a drawer that I could only reach by stretching on my tiptoes and scrabbling around in the drawer for the money (not tall enough to see). I pulled the penny out without looking at it and put it in my pocket. When I got to school, I realised I'd taken a half crown which was approx the same size as the penny, and stupidly I spent some of it on sweets. I never got sweets as a rule so this was like Christmas . I didn't eat the sweets, I took them home with me as well as the change at the end of the day, and presentd them to her , but my mother marched me down to the police station and demand I be charged with theft . I can still see it all playing out in my minds eye to this day. This (to me ) Huge police officer behind the desk, comes around, takes me by the hand and marches me into a Police cell....clearly he had no intention of arresting me because he left me in there for just a few minutes, before letting me out again (scare tactics) ... and he spoke very gently to me too warning me not to do it again.. before sending me home with my mother !! That was around 1961 or '62