Common Sense or unnescessary search?

My vote is common sense.

The newest big story is the FBI's monitoring of Mosques. Now, if the story is to be trusted, they never entered into any property. The went on to property (in about 15% of the searches), but not inside structures. It is unclear whether they were looking for actual nuclear weapons, or materials for a Dirty Bomb.

This type of search appears to be similar to those conducted utilizing parabolic microphones. While these type of monitoring are an interesting topic for discussion, it is hard to make a case that they should be prohibited for use by law enforcement, considering the nature of the threats that are faced today.