Found the opinion. Need the Reader's Digest version. Yikes!

Found an article from the FBI - "J Hall - FBI Law Enforcement Bulletin, 1997" at http://www.fbi.gov/publications/leb/1997/oct975.htm

This article covers different scenarios in an understandable way. There is one thing about the article that troubles me. Hall uses the term suspect to describe the person receiving law enforcement attention.

This has the potential to be like peeling a very large onion, layer by layer.

What constitutes being or becoming a suspect?

Am I a de facto suspect just by purchasing an airline ticket? I wouldn't think so.

Something about my behavior must be special.

I would imagine that there is TSA training on identifying "special" behaviors.

When a passenger expresses their displeasure with their airport security experience that is observable by airport security personnel, are they exhibiting the "special" behavior that magically turns them into a suspect? It can't be that simple.

So what are the rules?