Camera capable devices are generally frowned upon for obvious reasons. That would include the Playbook in its current config.
Have a few friends with security clearances, so been down this road.
No, it's been around since 1915, one of the oldest and biggest US gov labs. We're not the only ones with a high number of iOS devices in government, so this is not an isolated example.
Laptops generally get their cameras removed or disabled before use in secure areas. These services are offered for cell phones and tablets as well. However, those types of devices are not allowed in and out of certain areas unless their communications capabilities are also disabled (which defeats the purpose of some devices).
