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RFID vs AM?

Submitted by lift_fever in Shoplifting (edited )

I have an RFID-blocking waist stash. It’s worked once on a tag at Urban Outfitters and a guy who uses the same one on the old subreddit said it works on spider wraps and RFID stickers. I tried it on a spider wrap at Walmart and I beeped. I’m thinking maybe it’s because Walmart uses an AM system for their spider wrapped products? Or maybe it was a coincidence that the Urban Outfitters tag was unactivated.

Edit: Should add that it didn’t work at VS either for a girl on Tumblr

Comments

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Drshoplifter wrote

Faraday fabric definitely won’t block an am signal

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lift_fever wrote

How can you tell if something is RFID tagged or AM tagged? I read online that RFID is tagged to the identification of the product but for things like clothes you really can’t tell...

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bwqrdsaf wrote

If the sticker tag is flat and somewhat large like about 1" around, it's probably RF. Target and Toys R Us for example uses this. If it's narrow and thick (about 1/4" wide and 1/8" thick), it's likely AM.

RFID is different and is rarely used in shoplifter prevention in USA AFAIK. Each RFID tag contains unique serial number meant to be used for inventory tracking at warehouses and factories. Stores that uses RFID for security use would have scanner at each checkout to scan the whole basket or cart and ring up total in seconds so you could simply walk through, use smart phone to pay, and leave.

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DamnScalper wrote

So you could hack a RFID label? Say put the code of a cheaper item?

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bwqrdsaf wrote

RFID can't be changed (only deactivated) but generally scanner only looks for the bar code which are black and white stripes about 1" by 1" (2.5cm by 2.5cm) with 10, 12, or 13 numbers below it. Changing that will fool scanner but don't get too greedy like that one couple who used 29 cents notebook UPC on dozens of $25 baby formula cans.

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Drshoplifter wrote

It’s amost always RFID.

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Drshoplifter wrote

I’m pretty sure aluminum foil will block a.m. signals. I tested it with an am radio and it blocked it completely out, whereas the faraday fabric didn’t.

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lift_fever wrote

So do you think it was a coincidence that I didn’t beep at UO? Because both the other times I or someone else has tried it the waist stash didn’t block the signals. Maybe I should try it again at a low-risk store...