You have to see them come in w/o product, take the product, conceal the product, once they conceal the product you can't lose sight of them, and then they have to go beyond all points of sale.
No offense, but most of those sound either wrong or VERY store-specific, not law.
See them come in w/o product - you can't exactly see if her closed purse has spice in it when she comes in.
conceal the product - I can steal something without concealing it, this says that walking out the door with a humidifier in my hands would be grounds for dismissal.
can't lose sight of them - there's really nothing valid about this, you can be checked for shoplifting if they have a reason to suspect you, if there are only two employees in F.Y.E., for instance, there's no way they can keep eyes on you the entire time with other customers in the store.
have to go beyond all points of sale - That's mostly correct, but technically they have to either physically leave the store or in the case of stores like wal-mart, they have to enter the division zone where the carts/greeters are kept. Target, not really having that, will have to "meet" you outside of the front door. I think the rule of thumb is "beyond the front door security beeper".