[Hopey]

So you're arguing that a private citizen is permitted by law to detain and search another private citizen based merely on a reasonable suspicion? This isn't something that is only permitted to law enforcement officers?

The reasonable suspicion in this case being that a private citizen just purchased items in your store and is now trying to leave the premises without showing you a receipt on the way out the door.

What if this private citizen enters the building but then leaves your store without buying something? Do you have a reasonable suspicion to detain and search him in this case? What if he "looks suspicious" to you?