I'm not trying to start an argument with this, believe me... but I have been on both sides of the customer service desk, so I tend to see the "other" side better than most.
You're right, Choad, that they have to have HEAVY suspicion before they detain you. But if you are asked repeatedly to show a receipt -- and you refuse to -- that's a pretty big case for suspicion.
You say your reason is "one line per store". Fine. Walk right by the receipt checking guy. If you're stopped in the parking lot (as is evidenced by your strips), you're out of excuses. You're not in a line, and you're taking more time refusing than you would take just showing your receipt. (Yeah, I understand that the comic was for teh funny, but you get the drift.)
Once you're marked as "uncooperative", they'll watch you like a hawk. Fine, if you never make any mistakes that could be considered criminal -- but all it will take is that one "oops. I stuck this in my coat pocket because I didn't want to have to get a basket, and then forgot to take it back out when I got to the checkstand." And then you *will* be posting your comics from a jail cell. Because service people are vindictive like that.
(Reminds me of all those New Year's Days I worked... ah, sweet, not-so-subtle revenge...)
Oh yeah... and it gets especially nasty when they have "off-duty" police officers working for security. They're not nearly as restricted as store personnel when it comes to detaining someone. At least in Texas. Where I live.
As for billee's story: That's kind of what I was getting at too -- if you don't show that you bought what you bought, for all they know you *are* a shoplifter. It's not really worth their effort to pursue it from the criminal angle, granted, but their system is in place to protect them, the store, and us, the consumers. Face it -- the less "free" stuff that goes out the door, the less often they HAVE to raise their prices to get it back. (Then they just raise the prices out of greed.)
And also, as jes said, it was a good series. ((**there's a smiley here somewhere with your name on it**))
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This is not my empire.