Your suggestion with the teacher faking ID in front of a class is already a lesson performed at some London secondary schools.
and @all of those who think parents can just 'educate' their kids to be safe
teenage kids will listen to what suits them and then go off and do what they want to, they know everything and they know best and they'll often push whichever bioundaries they are provided with just for the hell of it.
I'm not by any means perfect but unmonitored use of a computer and a lecture about internet safety is not going to stop kids from exposing themselves to situations you'd rather they avoided.
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