That's what barbed wire fences are there for and CCTV and guys who should be patrolling the perimeter.

BBC: NEWS | UK | Scotland | Lap dancer breaches air security

The road rises, dips, twists, and turns along the eastern shore as it passes the occasional house, amid small herds of dairy and beef cattle behind barbed wire fences.

NPR: Environmentalist John Francis, Walking the Walk

And I recall how he showed me the barbed-wire fences and the guard towers.

WHITEHOUSE: President Obama Speaks on Preventing Mass Atrocities

Security measures at the compound included more than 12-foot-high barbed-wire fences and access restricted by two security gates.

WSJ: How bin Laden Was Found and Killed

Just a few miles away stand the new floodlights, barbed-wire fences and gleaming smokestacks of Pump Station No. 2, a fortified multimillion-dollar compound that straddles the pipeline.

NPR: Georgia Hopes for Boost from Caspian Pipeline

They were climbing lamp posts, sitting on barbed-wire fences, standing on the roofs of cars and buses and some not fussed about getting a baton around the kneecaps by the police.

BBC: Cricket World Cup: Andrew White column

Fences, barbed wire and a strong police force kept them back from the delegate gathering at Chicago's International Ampitheater.

NPR: Recalling the Mayhem of '68 Convention

All the compounds are surrounded by high fences, most of the walls wearing garlands of electric barbed wire.

NEWYORKER: Baptizing the Gun