It. Is tricky because we teach them not to talk to strangers but to approach a policeman or someone in authority....who most of the time will be a stranger.

Some schools of thought teach about tricky people. Tricky people want them to break safety rules (leave without mum or dad) or do something that makes them uncomfortable. They may be known to a child.

We have taught our kids about rules for their body from a young age. Tat helps with that concept.