I know I'm bringing up a dead topic, but I figured I'd mention comment anyway.
I used to be security for Target. Started out as the lowly security at the front door, moved to undercover, then to district. Target has some interesting policies, unbeknownst to the customers.
One of which is that the employee is always right. Target has a policy that, in store (meaning it doesn't include calling customer relations), managers are supposed to back the employee, unless he or she is blatantly disregarding the law or a strict policy. That means any employee can ask any customer to leave the store, or refuse any transaction, or just refuse service at any time without reason. The security is supposed to be the ones handling customers in that situation, and will almost ALWAYS back the employee.
Target Corporation (despite being a French organization), has an interesting policy toward firearms. They allow customer to carry firearms, whether it be CC or OC, and actually welcome it with open arms. However, the security on duty reserves the right to approach, question, and refuse any customer carrying for any reason. The only reason they would, though, is if they were put on alert by another store (meaning, another place in the area got robbed by someone matching your description). And Target works very closely with every store in the area, even Wal-Mart and Kmart.
Target's head of security (AP-LOD) and Store Manager of each store is actually encouraged by corporate to carry, or keep a sidearm close-by.
The reason they have this view on customers carrying firearms is because the 4th Target store opened in the company, was robbed at gun point. It was a customer that was carrying a sidearm that shot and killed the two gunmen. Ever since then, they welcome it.
Now, this is a corporate policy, each individual store has the ability to write their own policy.
I just thought this might help.
Basic Gun Safety by Jeff Cooper:
1) All guns are always loaded
2) Never let the muzzle cover anything you aren't willing to destroy
3) Keep your finger off the trigger until your sights are on the target
4) Be sure of your target and what is beyond it