I live in an apt complex & no knocks on my door (or anyone's) in all the Halloweens I've been living here, which is good. I guess my complex allows trick-or-treating, otherwise, I'm sure they'd send a mass email to us saying it's not allowed because they email us notices about everything else. I didn't even hear any kids outside. I stopped handing out candy I believe in 1991. I know these days, the stores in the malls hand out candy, which is safer anyway.