I love the walking harnesses. I used them for both my boys and for dc kids. When using them for dc kids I have the parents fill out a permission form stating they will allow me to use one one their child. To date I haven't had a problem.

side note: when I was a kid my parents used a dog harness (on backwards) and a lease to keep me from running off. It didn't hurt me at all, in fact I don't even remember it. It kept me safe and I thank my parents for that.