I know it's not quite as simple as the fear-mongers want to present it as.
At work, all our items are tagged, now instead of just an external barcode but also an internal RFID tag. Even buying them 100K at a whack they were $0.40/ea. And fifty or so people were set aside to go through and tag everything we own. Three years later as we move equipment from office to office we start finding errors. Serious errors. Turns out our tracking vendor had settled on one particular tag format, our software didn't have that so we'd chosen something "pretty close" but our vendor went through a small, internal reconstruction and came out using their information a bit differently. Our software couldn't read their tagged information and it took months of experts scratching their heads to figure out that "pretty close" wasn't close enough.
SO the big bosses sent out emails that "hey, you guys, you've been doing it wrong all this time shame on you." And politely refused to take note of how those bosses' trained people set up all our equipment on what turned out to be a misunderstanding.
Reading the tag isn't all that hard -- any antenna can energize and read off the contents. But you might need a human to interpret the results, especially if the tag format they're actually using is different from the one they publish that they agreed to use.
Sorry I can't be of more specific help, but searching out the high-level tag datasheets might be an okay start.