List of Printers Which Do or Do Not Display Tracking Dots

My cursory research into this topic (this morning...) lead me to believe inkjet printers may be uncompromised (not printing steganographic dots). The NYTimes believed this to be the case as well back in 2008 (http://www.nytimes.com/2008/07/24/technology/personaltech/24...) - anyone with more knowledge of the subject have information about this?

I wrote the original article, and that consistently matches what we've learned and heard. However, that doesn't mean that forensics can never identify the printer that printed a document (there's an entire lab at Purdue that's been studying possible ways to do so for over a decade!), just that the printers are not intentionally engineered to track their users.

Edit: It looks like the Purdue lab was only publishing research from 2003 to 2010, or hasn't updated its web site.

So they perfected it and received a gag order under the State Secrets Act.