[mumblemumble]

My guess is that this works just like how it does in corporate security: It is vastly easier to add a new security policy than it is to remove it. Even when everyone knows something is useless or perhaps even harmful, nobody wants to be in a position to be held culpable on the off chance that retiring the policy is implicated in a future breach.

[donw]

Polygraphs are a $2 billion industry, and Upton Sinclair said it best: "It is difficult to get a man to understand something, when his salary depends on his not understanding it."

[whatshisface]

Sure, but what about the people buying polygraphs?

[someguydave]

Their jobs depend on the polygraph existing as a credible institution