Freda_Last,
As to how they get by with it, I will try to follow some of the logic of how they get around things legally, (this is only a layman's guess) :
1) Although there are laws against deceptive advertising, they don't publicly advertise, per se. Instead, they train participants to do their advertising. In Landmark, these participants, (many who sat at phone banks for hours
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Large Group Awareness Training, "Human Potential"