broken glass to keep children in or badies out?

I was walking to work one day when I noticed something quite strange…
In egypt it is common practice in rural areas to put broken glass atop walls to stop theives from climbing over them. It is also common in all areas for older schoolboys to jump over the wall to skip school!
AFAIK it is not common for schools to use broken glass to keep the schoolboys in! or that is what I was thinking when I saw this:
broken glass keeps children in

Two men outside the school tried to convince me that the glass was to keep theives and the like out… not the children in…

Whatever the reason I don’t think that broken glass is something that should stand out in a primary school
the school

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