I'm one of the few people who might actually be affected by this - I own a HP Color LaserJet 3500. As far as I can tell, it doesn't print anything when you send it a blank page.
I'd be interested in learning a bit more about this since it strikes me as a huge waste of yellow ink, which is pretty expensive. My yellow toner cartridge costs $139 and prints about 4,400 color sheets.
I don't know if my LaserJet does this because it seems to separately track monochrome and color prints. Perhaps only color prints get this technology?
Or maybe it uses a different technology since my yellow cartridge was last to run out (it's actually on its last few hundred pages as I speak, while my cyan and magenta cartridges are long since replaced with new ones).
If you're really worried about this, buy a used color laser off eBay, or better yet, use a color inkjet you buy for $49.95 and throw it away when you're done.
Or just print subversive documents in monochrome.
D
Accorging to the info at http://www.eff.org/Privacy/printers/list.php your printer does indeed have tracking dots. get a good magnifying glass like a lupe lens. A Swiss army knife lens works OK too. View in bright light with the lens right up against your eye. It might take a minute of looking before your brain "locks on" to the dots. Don't waste time panning around; the dots are everywhere. Any given field of view will have at least a hundred.
If you have a good table scanner, scan a small area at high resolution and play with costrast, intensity, and yellow color enhancement in the scanner's preview pane.You can do this agaim after scanning to get better contrast, but do befoe scanning to optimize the scan itself.