Originally Posted by Wally Bird

Most "authorities" on the subject are primarily interested in selling those books. And videos, and seminars, yadda, yadda.

It's not a science, perhaps an art to those with an aptitude for it; and (bottom line) it's by no means foolproof. A person who either doesn't know he/she is lying or believes the lie to be true will not exhibit any behaviour even a highly experienced observer would pick up. The average BDO has no chance.

They (BDOs) are supposed to be looking for terrorists (as opposed to just fishing) and since terrorists are psychopaths or utterly convinced of their actions, or both, they won't be exhibiting anything out of the ordinary.

But go ahead, keep catching druggies, "money launderers", under-age college kids, deadbeat dads etc.

It Keeps Us All Safe. Barf.