I see you're a Troll

That is a lie and this is all very off topic. With that said, I don't need to go to any lengths to prove it. My post history stands for itself with other posts on /r/legaladvice.

Putting something in your pocket [...]

As someone actually licensed as a "private proprietary security officer" a.k.a. rent-a-cop, I can say that no one gives a fuck about the security guard's opinion of what happened. If you don't have video tape or something similar to back you up, don't do it. The lawsuits that they train us on are very good evidence of that. The only thing anyone cares about is what a peace officer (cop) saw or what the camera saw.

So you're claiming that any citizen can detain suspected shoplifters under the Merchant Rule?

If you're trying to reverse troll, you're doing a very poor job of it.

A "private proprietary security officer" acts on behalf of the owner of the building who is just a normal citizen like you or me. They can't do anything on the property that the owner can't do themselves. That is the law. The merchant rule allows merchants and their agents to temporarily detain someone they suspect of shoplifting. They aren't given special peace officer powers do to that. They are still only citizens at the time. They can't put you in handcuffs, physically restrain you, or anything else. Companies were sued over that and lost badly.

A customer is not an agent of the merchant or the merchant thus the merchant rule would not apply to them. It is not 'the customer rule' or 'the buyer at the store's rule'. It is 'The Merchant Rule'.